diff --git a/Makefile b/Makefile
index 7f9a57804b7760..21622a24047f68 100644
--- a/Makefile
+++ b/Makefile
@@ -129,7 +129,7 @@ out/Makefile: common.gypi deps/uv/uv.gyp deps/http_parser/http_parser.gyp \
               config.gypi
 	$(PYTHON) tools/gyp_node.py -f make
 
-config.gypi: configure
+config.gypi: configure configure.py
 	@if [ -x config.status ]; then \
 		./config.status; \
 	else \
diff --git a/configure b/configure
index c04118e9832b0c..495d0e8848860c 100755
--- a/configure
+++ b/configure
@@ -25,1632 +25,4 @@ if sys.version_info[0] != 2 or sys.version_info[1] not in (6, 7):
   sys.stderr.write('\n')
   sys.exit(1)
 
-import errno
-import optparse
-import os
-import pipes
-import pprint
-import re
-import shlex
-import subprocess
-import shutil
-import string
-
-# If not run from node/, cd to node/.
-os.chdir(os.path.dirname(__file__) or '.')
-
-original_argv = sys.argv[1:]
-
-# gcc and g++ as defaults matches what GYP's Makefile generator does,
-# except on OS X.
-CC = os.environ.get('CC', 'cc' if sys.platform == 'darwin' else 'gcc')
-CXX = os.environ.get('CXX', 'c++' if sys.platform == 'darwin' else 'g++')
-
-sys.path.insert(0, os.path.join('tools', 'gyp', 'pylib'))
-from gyp.common import GetFlavor
-
-# imports in tools/configure.d
-sys.path.insert(0, os.path.join('tools', 'configure.d'))
-import nodedownload
-
-# imports in tools/
-sys.path.insert(0, 'tools')
-import getmoduleversion
-from gyp_node import run_gyp
-
-# imports in deps/v8/tools/node
-sys.path.insert(0, os.path.join('deps', 'v8', 'tools', 'node'))
-from fetch_deps import FetchDeps
-
-# parse our options
-parser = optparse.OptionParser()
-
-valid_os = ('win', 'mac', 'solaris', 'freebsd', 'openbsd', 'linux',
-            'android', 'aix', 'cloudabi')
-valid_arch = ('arm', 'arm64', 'ia32', 'mips', 'mipsel', 'mips64el', 'ppc',
-              'ppc64', 'x32','x64', 'x86', 'x86_64', 's390', 's390x')
-valid_arm_float_abi = ('soft', 'softfp', 'hard')
-valid_arm_fpu = ('vfp', 'vfpv3', 'vfpv3-d16', 'neon')
-valid_mips_arch = ('loongson', 'r1', 'r2', 'r6', 'rx')
-valid_mips_fpu = ('fp32', 'fp64', 'fpxx')
-valid_mips_float_abi = ('soft', 'hard')
-valid_intl_modes = ('none', 'small-icu', 'full-icu', 'system-icu')
-
-# create option groups
-shared_optgroup = optparse.OptionGroup(parser, "Shared libraries",
-    "Flags that allows you to control whether you want to build against "
-    "built-in dependencies or its shared representations. If necessary, "
-    "provide multiple libraries with comma.")
-intl_optgroup = optparse.OptionGroup(parser, "Internationalization",
-    "Flags that lets you enable i18n features in Node.js as well as which "
-    "library you want to build against.")
-http2_optgroup = optparse.OptionGroup(parser, "HTTP2",
-    "Flags that allows you to control HTTP2 features in Node.js")
-
-# Options should be in alphabetical order but keep --prefix at the top,
-# that's arguably the one people will be looking for most.
-parser.add_option('--prefix',
-    action='store',
-    dest='prefix',
-    default='/usr/local',
-    help='select the install prefix [default: %default]')
-
-parser.add_option('--coverage',
-    action='store_true',
-    dest='coverage',
-    help='Build node with code coverage enabled')
-
-parser.add_option('--debug',
-    action='store_true',
-    dest='debug',
-    help='also build debug build')
-
-parser.add_option('--dest-cpu',
-    action='store',
-    dest='dest_cpu',
-    choices=valid_arch,
-    help='CPU architecture to build for ({0})'.format(', '.join(valid_arch)))
-
-parser.add_option('--cross-compiling',
-    action='store_true',
-    dest='cross_compiling',
-    default=None,
-    help='force build to be considered as cross compiled')
-parser.add_option('--no-cross-compiling',
-    action='store_false',
-    dest='cross_compiling',
-    default=None,
-    help='force build to be considered as NOT cross compiled')
-
-parser.add_option('--dest-os',
-    action='store',
-    dest='dest_os',
-    choices=valid_os,
-    help='operating system to build for ({0})'.format(', '.join(valid_os)))
-
-parser.add_option('--gdb',
-    action='store_true',
-    dest='gdb',
-    help='add gdb support')
-
-parser.add_option('--no-ifaddrs',
-    action='store_true',
-    dest='no_ifaddrs',
-    help='use on deprecated SunOS systems that do not support ifaddrs.h')
-
-parser.add_option("--fully-static",
-    action="store_true",
-    dest="fully_static",
-    help="Generate an executable without external dynamic libraries. This "
-         "will not work on OSX when using the default compilation environment")
-
-parser.add_option("--partly-static",
-    action="store_true",
-    dest="partly_static",
-    help="Generate an executable with libgcc and libstdc++ libraries. This "
-         "will not work on OSX when using the default compilation environment")
-
-parser.add_option("--enable-vtune-profiling",
-    action="store_true",
-    dest="enable_vtune_profiling",
-    help="Enable profiling support for Intel VTune profiler to profile "
-         "JavaScript code executed in nodejs. This feature is only available "
-         "for x32, x86, and x64 architectures.")
-
-parser.add_option("--enable-pgo-generate",
-    action="store_true",
-    dest="enable_pgo_generate",
-    help="Enable profiling with pgo of a binary. This feature is only available "
-         "on linux with gcc and g++ 5.4.1 or newer.")
-
-parser.add_option("--enable-pgo-use",
-    action="store_true",
-    dest="enable_pgo_use",
-    help="Enable use of the profile generated with --enable-pgo-generate. This "
-         "feature is only available on linux with gcc and g++ 5.4.1 or newer.")
-
-parser.add_option("--enable-lto",
-    action="store_true",
-    dest="enable_lto",
-    help="Enable compiling with lto of a binary. This feature is only available "
-         "on linux with gcc and g++ 5.4.1 or newer.")
-
-parser.add_option("--link-module",
-    action="append",
-    dest="linked_module",
-    help="Path to a JS file to be bundled in the binary as a builtin. "
-         "This module will be referenced by path without extension; "
-         "e.g. /root/x/y.js will be referenced via require('root/x/y'). "
-         "Can be used multiple times")
-
-parser.add_option("--openssl-no-asm",
-    action="store_true",
-    dest="openssl_no_asm",
-    help="Do not build optimized assembly for OpenSSL")
-
-parser.add_option('--openssl-fips',
-    action='store',
-    dest='openssl_fips',
-    help='Build OpenSSL using FIPS canister .o file in supplied folder')
-
-parser.add_option('--openssl-use-def-ca-store',
-    action='store_true',
-    dest='use_openssl_ca_store',
-    help='Use OpenSSL supplied CA store instead of compiled-in Mozilla CA copy.')
-
-parser.add_option('--openssl-system-ca-path',
-    action='store',
-    dest='openssl_system_ca_path',
-    help='Use the specified path to system CA (PEM format) in addition to '
-         'the OpenSSL supplied CA store or compiled-in Mozilla CA copy.')
-
-shared_optgroup.add_option('--shared-http-parser',
-    action='store_true',
-    dest='shared_http_parser',
-    help='link to a shared http_parser DLL instead of static linking')
-
-shared_optgroup.add_option('--shared-http-parser-includes',
-    action='store',
-    dest='shared_http_parser_includes',
-    help='directory containing http_parser header files')
-
-shared_optgroup.add_option('--shared-http-parser-libname',
-    action='store',
-    dest='shared_http_parser_libname',
-    default='http_parser',
-    help='alternative lib name to link to [default: %default]')
-
-shared_optgroup.add_option('--shared-http-parser-libpath',
-    action='store',
-    dest='shared_http_parser_libpath',
-    help='a directory to search for the shared http_parser DLL')
-
-shared_optgroup.add_option('--shared-libuv',
-    action='store_true',
-    dest='shared_libuv',
-    help='link to a shared libuv DLL instead of static linking')
-
-shared_optgroup.add_option('--shared-libuv-includes',
-    action='store',
-    dest='shared_libuv_includes',
-    help='directory containing libuv header files')
-
-shared_optgroup.add_option('--shared-libuv-libname',
-    action='store',
-    dest='shared_libuv_libname',
-    default='uv',
-    help='alternative lib name to link to [default: %default]')
-
-shared_optgroup.add_option('--shared-libuv-libpath',
-    action='store',
-    dest='shared_libuv_libpath',
-    help='a directory to search for the shared libuv DLL')
-
-shared_optgroup.add_option('--shared-nghttp2',
-    action='store_true',
-    dest='shared_nghttp2',
-    help='link to a shared nghttp2 DLL instead of static linking')
-
-shared_optgroup.add_option('--shared-nghttp2-includes',
-    action='store',
-    dest='shared_nghttp2_includes',
-    help='directory containing nghttp2 header files')
-
-shared_optgroup.add_option('--shared-nghttp2-libname',
-    action='store',
-    dest='shared_nghttp2_libname',
-    default='nghttp2',
-    help='alternative lib name to link to [default: %default]')
-
-shared_optgroup.add_option('--shared-nghttp2-libpath',
-    action='store',
-    dest='shared_nghttp2_libpath',
-    help='a directory to search for the shared nghttp2 DLLs')
-
-shared_optgroup.add_option('--shared-openssl',
-    action='store_true',
-    dest='shared_openssl',
-    help='link to a shared OpenSSl DLL instead of static linking')
-
-shared_optgroup.add_option('--shared-openssl-includes',
-    action='store',
-    dest='shared_openssl_includes',
-    help='directory containing OpenSSL header files')
-
-shared_optgroup.add_option('--shared-openssl-libname',
-    action='store',
-    dest='shared_openssl_libname',
-    default='crypto,ssl',
-    help='alternative lib name to link to [default: %default]')
-
-shared_optgroup.add_option('--shared-openssl-libpath',
-    action='store',
-    dest='shared_openssl_libpath',
-    help='a directory to search for the shared OpenSSL DLLs')
-
-shared_optgroup.add_option('--shared-zlib',
-    action='store_true',
-    dest='shared_zlib',
-    help='link to a shared zlib DLL instead of static linking')
-
-shared_optgroup.add_option('--shared-zlib-includes',
-    action='store',
-    dest='shared_zlib_includes',
-    help='directory containing zlib header files')
-
-shared_optgroup.add_option('--shared-zlib-libname',
-    action='store',
-    dest='shared_zlib_libname',
-    default='z',
-    help='alternative lib name to link to [default: %default]')
-
-shared_optgroup.add_option('--shared-zlib-libpath',
-    action='store',
-    dest='shared_zlib_libpath',
-    help='a directory to search for the shared zlib DLL')
-
-shared_optgroup.add_option('--shared-cares',
-    action='store_true',
-    dest='shared_libcares',
-    help='link to a shared cares DLL instead of static linking')
-
-shared_optgroup.add_option('--shared-cares-includes',
-    action='store',
-    dest='shared_libcares_includes',
-    help='directory containing cares header files')
-
-shared_optgroup.add_option('--shared-cares-libname',
-    action='store',
-    dest='shared_libcares_libname',
-    default='cares',
-    help='alternative lib name to link to [default: %default]')
-
-shared_optgroup.add_option('--shared-cares-libpath',
-    action='store',
-    dest='shared_libcares_libpath',
-    help='a directory to search for the shared cares DLL')
-
-parser.add_option_group(shared_optgroup)
-
-parser.add_option('--systemtap-includes',
-    action='store',
-    dest='systemtap_includes',
-    help='directory containing systemtap header files')
-
-parser.add_option('--tag',
-    action='store',
-    dest='tag',
-    help='custom build tag')
-
-parser.add_option('--release-urlbase',
-    action='store',
-    dest='release_urlbase',
-    help='Provide a custom URL prefix for the `process.release` properties '
-         '`sourceUrl` and `headersUrl`. When compiling a release build, this '
-         'will default to https://nodejs.org/download/release/')
-
-parser.add_option('--enable-d8',
-    action='store_true',
-    dest='enable_d8',
-    help=optparse.SUPPRESS_HELP)  # Unsupported, undocumented.
-
-parser.add_option('--enable-trace-maps',
-    action='store_true',
-    dest='trace_maps',
-    help='Enable the --trace-maps flag in V8 (use at your own risk)')
-
-parser.add_option('--v8-options',
-    action='store',
-    dest='v8_options',
-    help='v8 options to pass, see `node --v8-options` for examples.')
-
-parser.add_option('--with-arm-float-abi',
-    action='store',
-    dest='arm_float_abi',
-    choices=valid_arm_float_abi,
-    help='specifies which floating-point ABI to use ({0}).'.format(
-        ', '.join(valid_arm_float_abi)))
-
-parser.add_option('--with-arm-fpu',
-    action='store',
-    dest='arm_fpu',
-    choices=valid_arm_fpu,
-    help='ARM FPU mode ({0}) [default: %default]'.format(
-        ', '.join(valid_arm_fpu)))
-
-parser.add_option('--with-mips-arch-variant',
-    action='store',
-    dest='mips_arch_variant',
-    default='r2',
-    choices=valid_mips_arch,
-    help='MIPS arch variant ({0}) [default: %default]'.format(
-        ', '.join(valid_mips_arch)))
-
-parser.add_option('--with-mips-fpu-mode',
-    action='store',
-    dest='mips_fpu_mode',
-    default='fp32',
-    choices=valid_mips_fpu,
-    help='MIPS FPU mode ({0}) [default: %default]'.format(
-        ', '.join(valid_mips_fpu)))
-
-parser.add_option('--with-mips-float-abi',
-    action='store',
-    dest='mips_float_abi',
-    default='hard',
-    choices=valid_mips_float_abi,
-    help='MIPS floating-point ABI ({0}) [default: %default]'.format(
-        ', '.join(valid_mips_float_abi)))
-
-parser.add_option('--with-dtrace',
-    action='store_true',
-    dest='with_dtrace',
-    help='build with DTrace (default is true on sunos and darwin)')
-
-parser.add_option('--with-etw',
-    action='store_true',
-    dest='with_etw',
-    help='build with ETW (default is true on Windows)')
-
-intl_optgroup.add_option('--with-intl',
-    action='store',
-    dest='with_intl',
-    default='small-icu',
-    choices=valid_intl_modes,
-    help='Intl mode (valid choices: {0}) [default: %default]'.format(
-        ', '.join(valid_intl_modes)))
-
-intl_optgroup.add_option('--without-intl',
-    action='store_const',
-    dest='with_intl',
-    const='none',
-    help='Disable Intl, same as --with-intl=none (disables inspector)')
-
-intl_optgroup.add_option('--with-icu-path',
-    action='store',
-    dest='with_icu_path',
-    help='Path to icu.gyp (ICU i18n, Chromium version only.)')
-
-icu_default_locales='root,en'
-
-intl_optgroup.add_option('--with-icu-locales',
-    action='store',
-    dest='with_icu_locales',
-    default=icu_default_locales,
-    help='Comma-separated list of locales for "small-icu". "root" is assumed. '
-        '[default: %default]')
-
-intl_optgroup.add_option('--with-icu-source',
-    action='store',
-    dest='with_icu_source',
-    help='Intl mode: optional local path to icu/ dir, or path/URL of icu source archive.')
-
-parser.add_option('--with-ltcg',
-    action='store_true',
-    dest='with_ltcg',
-    help='Use Link Time Code Generation. This feature is only available on Windows.')
-
-parser.add_option('--with-pch',
-    action='store_true',
-    dest='with_pch',
-    help='Use Precompiled Headers (only available on Windows).')
-
-intl_optgroup.add_option('--download',
-    action='store',
-    dest='download_list',
-    help=nodedownload.help())
-
-intl_optgroup.add_option('--download-path',
-    action='store',
-    dest='download_path',
-    default='deps',
-    help='Download directory [default: %default]')
-
-parser.add_option_group(intl_optgroup)
-
-parser.add_option('--debug-lib',
-    action='store_true',
-    dest='node_debug_lib',
-    help='build lib with DCHECK macros')
-
-http2_optgroup.add_option('--debug-nghttp2',
-    action='store_true',
-    dest='debug_nghttp2',
-    help='build nghttp2 with DEBUGBUILD (default is false)')
-
-parser.add_option_group(http2_optgroup)
-
-parser.add_option('--with-perfctr',
-    action='store_true',
-    dest='with_perfctr',
-    help='build with performance counters (default is true on Windows)')
-
-parser.add_option('--without-dtrace',
-    action='store_true',
-    dest='without_dtrace',
-    help='build without DTrace')
-
-parser.add_option('--without-etw',
-    action='store_true',
-    dest='without_etw',
-    help='build without ETW')
-
-parser.add_option('--without-npm',
-    action='store_true',
-    dest='without_npm',
-    help='do not install the bundled npm (package manager)')
-
-parser.add_option('--without-perfctr',
-    action='store_true',
-    dest='without_perfctr',
-    help='build without performance counters')
-
-# Dummy option for backwards compatibility
-parser.add_option('--with-snapshot',
-    action='store_true',
-    dest='unused_with_snapshot',
-    help=optparse.SUPPRESS_HELP)
-
-parser.add_option('--without-snapshot',
-    action='store_true',
-    dest='without_snapshot',
-    help=optparse.SUPPRESS_HELP)
-
-parser.add_option('--code-cache-path',
-    action='store',
-    dest='code_cache_path',
-    help='Use a file generated by tools/generate_code_cache.js to compile the'
-         ' code cache for builtin modules into the binary')
-
-parser.add_option('--without-ssl',
-    action='store_true',
-    dest='without_ssl',
-    help='build without SSL (disables crypto, https, inspector, etc.)')
-
-parser.add_option('--without-node-options',
-    action='store_true',
-    dest='without_node_options',
-    help='build without NODE_OPTIONS support')
-
-parser.add_option('--ninja',
-    action='store_true',
-    dest='use_ninja',
-    help='generate build files for use with Ninja')
-
-parser.add_option('--enable-asan',
-    action='store_true',
-    dest='enable_asan',
-    help='build with asan')
-
-parser.add_option('--enable-static',
-    action='store_true',
-    dest='enable_static',
-    help='build as static library')
-
-parser.add_option('--no-browser-globals',
-    action='store_true',
-    dest='no_browser_globals',
-    help='do not export browser globals like setTimeout, console, etc. ' +
-         '(This mode is not officially supported for regular applications)')
-
-parser.add_option('--without-inspector',
-    action='store_true',
-    dest='without_inspector',
-    help='disable the V8 inspector protocol')
-
-parser.add_option('--shared',
-    action='store_true',
-    dest='shared',
-    help='compile shared library for embedding node in another project. ' +
-         '(This mode is not officially supported for regular applications)')
-
-parser.add_option('--without-v8-platform',
-    action='store_true',
-    dest='without_v8_platform',
-    default=False,
-    help='do not initialize v8 platform during node.js startup. ' +
-         '(This mode is not officially supported for regular applications)')
-
-parser.add_option('--without-bundled-v8',
-    action='store_true',
-    dest='without_bundled_v8',
-    default=False,
-    help='do not use V8 includes from the bundled deps folder. ' +
-         '(This mode is not officially supported for regular applications)')
-
-parser.add_option('--build-v8-with-gn',
-    action='store_true',
-    dest='build_v8_with_gn',
-    default=False,
-    help='build V8 using GN instead of gyp')
-
-# Create compile_commands.json in out/Debug and out/Release.
-parser.add_option('-C',
-    action='store_true',
-    dest='compile_commands_json',
-    help=optparse.SUPPRESS_HELP)
-
-(options, args) = parser.parse_args()
-
-# Expand ~ in the install prefix now, it gets written to multiple files.
-options.prefix = os.path.expanduser(options.prefix or '')
-
-# set up auto-download list
-auto_downloads = nodedownload.parse(options.download_list)
-
-
-def error(msg):
-  prefix = '\033[1m\033[31mERROR\033[0m' if os.isatty(1) else 'ERROR'
-  print('%s: %s' % (prefix, msg))
-  sys.exit(1)
-
-def warn(msg):
-  warn.warned = True
-  prefix = '\033[1m\033[93mWARNING\033[0m' if os.isatty(1) else 'WARNING'
-  print('%s: %s' % (prefix, msg))
-
-# track if warnings occurred
-warn.warned = False
-
-def b(value):
-  """Returns the string 'true' if value is truthy, 'false' otherwise."""
-  if value:
-    return 'true'
-  else:
-    return 'false'
-
-
-def pkg_config(pkg):
-  pkg_config = os.environ.get('PKG_CONFIG', 'pkg-config')
-  retval = ()
-  for flag in ['--libs-only-l', '--cflags-only-I', '--libs-only-L']:
-    try:
-      proc = subprocess.Popen(
-          shlex.split(pkg_config) + ['--silence-errors', flag, pkg],
-          stdout=subprocess.PIPE)
-      val = proc.communicate()[0].strip()
-    except OSError as e:
-      if e.errno != errno.ENOENT: raise e  # Unexpected error.
-      return (None, None, None)  # No pkg-config/pkgconf installed.
-    retval += (val,)
-  return retval
-
-
-def try_check_compiler(cc, lang):
-  try:
-    proc = subprocess.Popen(shlex.split(cc) + ['-E', '-P', '-x', lang, '-'],
-                            stdin=subprocess.PIPE, stdout=subprocess.PIPE)
-  except OSError:
-    return (False, False, '', '')
-
-  proc.stdin.write('__clang__ __GNUC__ __GNUC_MINOR__ __GNUC_PATCHLEVEL__ '
-                   '__clang_major__ __clang_minor__ __clang_patchlevel__')
-
-  values = (proc.communicate()[0].split() + ['0'] * 7)[0:7]
-  is_clang = values[0] == '1'
-  gcc_version = tuple(values[1:1+3])
-  clang_version = tuple(values[4:4+3])
-
-  return (True, is_clang, clang_version, gcc_version)
-
-
-#
-# The version of asm compiler is needed for building openssl asm files.
-# See deps/openssl/openssl.gypi for detail.
-# Commands and regular expressions to obtain its version number are taken from
-# https://github.com/openssl/openssl/blob/OpenSSL_1_0_2-stable/crypto/sha/asm/sha512-x86_64.pl#L112-L129
-#
-def get_version_helper(cc, regexp):
-  try:
-    proc = subprocess.Popen(shlex.split(cc) + ['-v'], stdin=subprocess.PIPE,
-                            stderr=subprocess.PIPE, stdout=subprocess.PIPE)
-  except OSError:
-    error('''No acceptable C compiler found!
-
-       Please make sure you have a C compiler installed on your system and/or
-       consider adjusting the CC environment variable if you installed
-       it in a non-standard prefix.''')
-
-  match = re.search(regexp, proc.communicate()[1])
-
-  if match:
-    return match.group(2)
-  else:
-    return '0'
-
-def get_nasm_version(asm):
-  try:
-    proc = subprocess.Popen(shlex.split(asm) + ['-v'],
-                            stdin=subprocess.PIPE, stderr=subprocess.PIPE,
-                            stdout=subprocess.PIPE)
-  except OSError:
-    warn('''No acceptable ASM compiler found!
-         Please make sure you have installed NASM from http://www.nasm.us
-         and refer BUILDING.md.''')
-    return '0'
-
-  match = re.match(r"NASM version ([2-9]\.[0-9][0-9]+)",
-                   proc.communicate()[0])
-
-  if match:
-    return match.group(1)
-  else:
-    return '0'
-
-def get_llvm_version(cc):
-  return get_version_helper(
-    cc, r"(^(?:FreeBSD )?clang version|based on LLVM) ([3-9]\.[0-9]+)")
-
-def get_xcode_version(cc):
-  return get_version_helper(
-    cc, r"(^Apple LLVM version) ([0-9]+\.[0-9]+)")
-
-def get_gas_version(cc):
-  try:
-    custom_env = os.environ.copy()
-    custom_env["LC_ALL"] = "C"
-    proc = subprocess.Popen(shlex.split(cc) + ['-Wa,-v', '-c', '-o',
-                                               '/dev/null', '-x',
-                                               'assembler',  '/dev/null'],
-                            stdin=subprocess.PIPE, stderr=subprocess.PIPE,
-                            stdout=subprocess.PIPE, env=custom_env)
-  except OSError:
-    error('''No acceptable C compiler found!
-
-       Please make sure you have a C compiler installed on your system and/or
-       consider adjusting the CC environment variable if you installed
-       it in a non-standard prefix.''')
-
-  gas_ret = proc.communicate()[1]
-  match = re.match(r"GNU assembler version ([2-9]\.[0-9]+)", gas_ret)
-
-  if match:
-    return match.group(1)
-  else:
-    warn('Could not recognize `gas`: ' + gas_ret)
-    return '0'
-
-# Note: Apple clang self-reports as clang 4.2.0 and gcc 4.2.1.  It passes
-# the version check more by accident than anything else but a more rigorous
-# check involves checking the build number against a whitelist.  I'm not
-# quite prepared to go that far yet.
-def check_compiler(o):
-  if sys.platform == 'win32':
-    if not options.openssl_no_asm:
-      nasm_version = get_nasm_version('nasm')
-      o['variables']['nasm_version'] = nasm_version
-      if nasm_version == 0:
-        o['variables']['openssl_no_asm'] = 1
-    return
-
-  ok, is_clang, clang_version, gcc_version = try_check_compiler(CXX, 'c++')
-  if not ok:
-    warn('failed to autodetect C++ compiler version (CXX=%s)' % CXX)
-  elif clang_version < (3, 4, 2) if is_clang else gcc_version < (4, 9, 4):
-    warn('C++ compiler too old, need g++ 4.9.4 or clang++ 3.4.2 (CXX=%s)' % CXX)
-
-  ok, is_clang, clang_version, gcc_version = try_check_compiler(CC, 'c')
-  if not ok:
-    warn('failed to autodetect C compiler version (CC=%s)' % CC)
-  elif not is_clang and gcc_version < (4, 2, 0):
-    # clang 3.2 is a little white lie because any clang version will probably
-    # do for the C bits.  However, we might as well encourage people to upgrade
-    # to a version that is not completely ancient.
-    warn('C compiler too old, need gcc 4.2 or clang 3.2 (CC=%s)' % CC)
-
-  o['variables']['llvm_version'] = get_llvm_version(CC) if is_clang else 0
-
-  # Need xcode_version or gas_version when openssl asm files are compiled.
-  if options.without_ssl or options.openssl_no_asm or options.shared_openssl:
-    return
-
-  if is_clang:
-    if sys.platform == 'darwin':
-      o['variables']['xcode_version'] = get_xcode_version(CC)
-  else:
-    o['variables']['gas_version'] = get_gas_version(CC)
-
-
-def cc_macros(cc=None):
-  """Checks predefined macros using the C compiler command."""
-
-  try:
-    p = subprocess.Popen(shlex.split(cc or CC) + ['-dM', '-E', '-'],
-                         stdin=subprocess.PIPE,
-                         stdout=subprocess.PIPE,
-                         stderr=subprocess.PIPE)
-  except OSError:
-    error('''No acceptable C compiler found!
-
-       Please make sure you have a C compiler installed on your system and/or
-       consider adjusting the CC environment variable if you installed
-       it in a non-standard prefix.''')
-
-  p.stdin.write('\n')
-  out = p.communicate()[0]
-
-  out = str(out).split('\n')
-
-  k = {}
-  for line in out:
-    lst = shlex.split(line)
-    if len(lst) > 2:
-      key = lst[1]
-      val = lst[2]
-      k[key] = val
-  return k
-
-
-def is_arch_armv7():
-  """Check for ARMv7 instructions"""
-  cc_macros_cache = cc_macros()
-  return cc_macros_cache.get('__ARM_ARCH') == '7'
-
-
-def is_arch_armv6():
-  """Check for ARMv6 instructions"""
-  cc_macros_cache = cc_macros()
-  return cc_macros_cache.get('__ARM_ARCH') == '6'
-
-
-def is_arm_hard_float_abi():
-  """Check for hardfloat or softfloat eabi on ARM"""
-  # GCC versions 4.6 and above define __ARM_PCS or __ARM_PCS_VFP to specify
-  # the Floating Point ABI used (PCS stands for Procedure Call Standard).
-  # We use these as well as a couple of other defines to statically determine
-  # what FP ABI used.
-
-  return '__ARM_PCS_VFP' in cc_macros()
-
-
-def host_arch_cc():
-  """Host architecture check using the CC command."""
-
-  if sys.platform.startswith('aix'):
-    # we only support gcc at this point and the default on AIX
-    # would be xlc so hard code gcc
-    k = cc_macros('gcc')
-  else:
-    k = cc_macros(os.environ.get('CC_host'))
-
-  matchup = {
-    '__aarch64__' : 'arm64',
-    '__arm__'     : 'arm',
-    '__i386__'    : 'ia32',
-    '__MIPSEL__'  : 'mipsel',
-    '__mips__'    : 'mips',
-    '__PPC64__'   : 'ppc64',
-    '__PPC__'     : 'ppc64',
-    '__x86_64__'  : 'x64',
-    '__s390__'    : 's390',
-    '__s390x__'   : 's390x',
-  }
-
-  rtn = 'ia32' # default
-
-  for i in matchup:
-    if i in k and k[i] != '0':
-      rtn = matchup[i]
-      if rtn != 's390':
-        break
-
-  if rtn == 'mipsel' and '_LP64' in k:
-    rtn = 'mips64el'
-
-  return rtn
-
-
-def host_arch_win():
-  """Host architecture check using environ vars (better way to do this?)"""
-
-  observed_arch = os.environ.get('PROCESSOR_ARCHITECTURE', 'x86')
-  arch = os.environ.get('PROCESSOR_ARCHITEW6432', observed_arch)
-
-  matchup = {
-    'AMD64'  : 'x64',
-    'x86'    : 'ia32',
-    'arm'    : 'arm',
-    'mips'   : 'mips',
-  }
-
-  return matchup.get(arch, 'ia32')
-
-
-def configure_arm(o):
-  if options.arm_float_abi:
-    arm_float_abi = options.arm_float_abi
-  elif is_arm_hard_float_abi():
-    arm_float_abi = 'hard'
-  else:
-    arm_float_abi = 'default'
-
-  arm_fpu = 'vfp'
-
-  if is_arch_armv7():
-    arm_fpu = 'vfpv3'
-    o['variables']['arm_version'] = '7'
-  else:
-    o['variables']['arm_version'] = '6' if is_arch_armv6() else 'default'
-
-  o['variables']['arm_thumb'] = 0      # -marm
-  o['variables']['arm_float_abi'] = arm_float_abi
-
-  if options.dest_os == 'android':
-    arm_fpu = 'vfpv3'
-    o['variables']['arm_version'] = '7'
-
-  o['variables']['arm_fpu'] = options.arm_fpu or arm_fpu
-
-
-def configure_mips(o):
-  can_use_fpu_instructions = (options.mips_float_abi != 'soft')
-  o['variables']['v8_can_use_fpu_instructions'] = b(can_use_fpu_instructions)
-  o['variables']['v8_use_mips_abi_hardfloat'] = b(can_use_fpu_instructions)
-  o['variables']['mips_arch_variant'] = options.mips_arch_variant
-  o['variables']['mips_fpu_mode'] = options.mips_fpu_mode
-
-
-def gcc_version_ge(version_checked):
-  for compiler in [(CC, 'c'), (CXX, 'c++')]:
-    ok, is_clang, clang_version, compiler_version = \
-      try_check_compiler(compiler[0], compiler[1])
-    compiler_version_num = tuple(map(int, compiler_version))
-    if is_clang or compiler_version_num < version_checked:
-      return False
-  return True
-
-
-def configure_node(o):
-  if options.dest_os == 'android':
-    o['variables']['OS'] = 'android'
-  o['variables']['node_prefix'] = options.prefix
-  o['variables']['node_install_npm'] = b(not options.without_npm)
-  o['default_configuration'] = 'Debug' if options.debug else 'Release'
-
-  host_arch = host_arch_win() if os.name == 'nt' else host_arch_cc()
-  target_arch = options.dest_cpu or host_arch
-  # ia32 is preferred by the build tools (GYP) over x86 even if we prefer the latter
-  # the Makefile resets this to x86 afterward
-  if target_arch == 'x86':
-    target_arch = 'ia32'
-  # x86_64 is common across linuxes, allow it as an alias for x64
-  if target_arch == 'x86_64':
-    target_arch = 'x64'
-  o['variables']['host_arch'] = host_arch
-  o['variables']['target_arch'] = target_arch
-  o['variables']['node_byteorder'] = sys.byteorder
-
-  cross_compiling = (options.cross_compiling
-                     if options.cross_compiling is not None
-                     else target_arch != host_arch)
-  want_snapshots = not options.without_snapshot
-  o['variables']['want_separate_host_toolset'] = int(
-      cross_compiling and want_snapshots)
-
-  if target_arch == 'arm':
-    configure_arm(o)
-  elif target_arch in ('mips', 'mipsel', 'mips64el'):
-    configure_mips(o)
-
-  if flavor == 'aix':
-    o['variables']['node_target_type'] = 'static_library'
-
-  if target_arch in ('x86', 'x64', 'ia32', 'x32'):
-    o['variables']['node_enable_v8_vtunejit'] = b(options.enable_vtune_profiling)
-  elif options.enable_vtune_profiling:
-    raise Exception(
-       'The VTune profiler for JavaScript is only supported on x32, x86, and x64 '
-       'architectures.')
-  else:
-    o['variables']['node_enable_v8_vtunejit'] = 'false'
-
-  if flavor != 'linux' and (options.enable_pgo_generate or options.enable_pgo_use):
-    raise Exception(
-      'The pgo option is supported only on linux.')
-
-  if flavor == 'linux':
-    if options.enable_pgo_generate or options.enable_pgo_use:
-      version_checked = (5, 4, 1)
-      if not gcc_version_ge(version_checked):
-        version_checked_str = ".".join(map(str, version_checked))
-        raise Exception(
-          'The options --enable-pgo-generate and --enable-pgo-use '
-          'are supported for gcc and gxx %s or newer only.' % (version_checked_str))
-
-    if options.enable_pgo_generate and options.enable_pgo_use:
-      raise Exception(
-        'Only one of the --enable-pgo-generate or --enable-pgo-use options '
-        'can be specified at a time. You would like to use '
-        '--enable-pgo-generate first, profile node, and then recompile '
-        'with --enable-pgo-use')
-
-  o['variables']['enable_pgo_generate'] = b(options.enable_pgo_generate)
-  o['variables']['enable_pgo_use']      = b(options.enable_pgo_use)
-
-  if flavor != 'linux' and (options.enable_lto):
-    raise Exception(
-      'The lto option is supported only on linux.')
-
-  if flavor == 'linux':
-    if options.enable_lto:
-      version_checked = (5, 4, 1)
-      if not gcc_version_ge(version_checked):
-        version_checked_str = ".".join(map(str, version_checked))
-        raise Exception(
-          'The option --enable-lto is supported for gcc and gxx %s'
-          ' or newer only.' % (version_checked_str))
-
-  o['variables']['enable_lto'] = b(options.enable_lto)
-
-  if flavor in ('solaris', 'mac', 'linux', 'freebsd'):
-    use_dtrace = not options.without_dtrace
-    # Don't enable by default on linux and freebsd
-    if flavor in ('linux', 'freebsd'):
-      use_dtrace = options.with_dtrace
-
-    if flavor == 'linux':
-      if options.systemtap_includes:
-        o['include_dirs'] += [options.systemtap_includes]
-    o['variables']['node_use_dtrace'] = b(use_dtrace)
-  elif options.with_dtrace:
-    raise Exception(
-       'DTrace is currently only supported on SunOS, MacOS or Linux systems.')
-  else:
-    o['variables']['node_use_dtrace'] = 'false'
-
-  if options.no_ifaddrs:
-    o['defines'] += ['SUNOS_NO_IFADDRS']
-
-  # By default, enable ETW on Windows.
-  if flavor == 'win':
-    o['variables']['node_use_etw'] = b(not options.without_etw)
-  elif options.with_etw:
-    raise Exception('ETW is only supported on Windows.')
-  else:
-    o['variables']['node_use_etw'] = 'false'
-
-  # By default, enable Performance counters on Windows.
-  if flavor == 'win':
-    o['variables']['node_use_perfctr'] = b(not options.without_perfctr)
-  elif options.with_perfctr:
-    raise Exception('Performance counter is only supported on Windows.')
-  else:
-    o['variables']['node_use_perfctr'] = 'false'
-
-  o['variables']['node_with_ltcg'] = b(options.with_ltcg)
-  if flavor != 'win' and options.with_ltcg:
-    raise Exception('Link Time Code Generation is only supported on Windows.')
-
-  if flavor == 'win':
-    o['variables']['node_use_pch'] = b(options.with_pch)
-  else:
-    o['variables']['node_use_pch'] = 'false'
-
-  if options.tag:
-    o['variables']['node_tag'] = '-' + options.tag
-  else:
-    o['variables']['node_tag'] = ''
-
-  o['variables']['node_release_urlbase'] = options.release_urlbase or ''
-
-  if options.v8_options:
-    o['variables']['node_v8_options'] = options.v8_options.replace('"', '\\"')
-
-  if options.enable_static:
-    o['variables']['node_target_type'] = 'static_library'
-
-  o['variables']['node_debug_lib'] = b(options.node_debug_lib)
-
-  if options.debug_nghttp2:
-    o['variables']['debug_nghttp2'] = 1
-  else:
-    o['variables']['debug_nghttp2'] = 'false'
-
-  o['variables']['node_no_browser_globals'] = b(options.no_browser_globals)
-  if options.code_cache_path:
-    o['variables']['node_code_cache_path'] = options.code_cache_path
-  o['variables']['node_shared'] = b(options.shared)
-  node_module_version = getmoduleversion.get_version()
-
-  if sys.platform == 'darwin':
-    shlib_suffix = '%s.dylib'
-  elif sys.platform.startswith('aix'):
-    shlib_suffix = '%s.a'
-  else:
-    shlib_suffix = 'so.%s'
-
-  shlib_suffix %= node_module_version
-  o['variables']['node_module_version'] = int(node_module_version)
-  o['variables']['shlib_suffix'] = shlib_suffix
-
-  if options.linked_module:
-    o['variables']['library_files'] = options.linked_module
-
-  o['variables']['asan'] = int(options.enable_asan or 0)
-
-  if options.coverage:
-    o['variables']['coverage'] = 'true'
-  else:
-    o['variables']['coverage'] = 'false'
-
-  if options.shared:
-    o['variables']['node_target_type'] = 'shared_library'
-  elif options.enable_static:
-    o['variables']['node_target_type'] = 'static_library'
-  else:
-    o['variables']['node_target_type'] = 'executable'
-
-def configure_library(lib, output):
-  shared_lib = 'shared_' + lib
-  output['variables']['node_' + shared_lib] = b(getattr(options, shared_lib))
-
-  if getattr(options, shared_lib):
-    (pkg_libs, pkg_cflags, pkg_libpath) = pkg_config(lib)
-
-    if options.__dict__[shared_lib + '_includes']:
-      output['include_dirs'] += [options.__dict__[shared_lib + '_includes']]
-    elif pkg_cflags:
-      output['include_dirs'] += (
-          filter(None, map(str.strip, pkg_cflags.split('-I'))))
-
-    # libpath needs to be provided ahead libraries
-    if options.__dict__[shared_lib + '_libpath']:
-      if flavor == 'win':
-        if 'msvs_settings' not in output:
-          output['msvs_settings'] = { 'VCLinkerTool': { 'AdditionalOptions': [] } }
-        output['msvs_settings']['VCLinkerTool']['AdditionalOptions'] += [
-          '/LIBPATH:%s' % options.__dict__[shared_lib + '_libpath']]
-      else:
-        output['libraries'] += [
-            '-L%s' % options.__dict__[shared_lib + '_libpath']]
-    elif pkg_libpath:
-      output['libraries'] += [pkg_libpath]
-
-    default_libs = getattr(options, shared_lib + '_libname')
-    default_libs = map('-l{0}'.format, default_libs.split(','))
-
-    if default_libs:
-      output['libraries'] += default_libs
-    elif pkg_libs:
-      output['libraries'] += pkg_libs.split()
-
-
-def configure_v8(o):
-  o['variables']['v8_enable_gdbjit'] = 1 if options.gdb else 0
-  o['variables']['v8_no_strict_aliasing'] = 1  # Work around compiler bugs.
-  o['variables']['v8_optimized_debug'] = 0  # Compile with -O0 in debug builds.
-  o['variables']['v8_random_seed'] = 0  # Use a random seed for hash tables.
-  o['variables']['v8_promise_internal_field_count'] = 1 # Add internal field to promises for async hooks.
-  o['variables']['v8_use_snapshot'] = 'false' if options.without_snapshot else 'true'
-  o['variables']['v8_trace_maps'] = 1 if options.trace_maps else 0
-  o['variables']['node_use_v8_platform'] = b(not options.without_v8_platform)
-  o['variables']['node_use_bundled_v8'] = b(not options.without_bundled_v8)
-  o['variables']['force_dynamic_crt'] = 1 if options.shared else 0
-  o['variables']['node_enable_d8'] = b(options.enable_d8)
-  # Unconditionally force typed arrays to allocate outside the v8 heap. This
-  # is to prevent memory pointers from being moved around that are returned by
-  # Buffer::Data().
-  o['variables']['v8_typed_array_max_size_in_heap'] = 0
-  if options.enable_d8:
-    o['variables']['test_isolation_mode'] = 'noop'  # Needed by d8.gyp.
-  if options.without_bundled_v8 and options.enable_d8:
-    raise Exception('--enable-d8 is incompatible with --without-bundled-v8.')
-  if options.without_bundled_v8 and options.build_v8_with_gn:
-    raise Exception(
-        '--build-v8-with-gn is incompatible with --without-bundled-v8.')
-  if options.build_v8_with_gn:
-    v8_path = os.path.join('deps', 'v8')
-    print('Fetching dependencies to build V8 with GN')
-    options.build_v8_with_gn = FetchDeps(v8_path)
-  o['variables']['build_v8_with_gn'] = b(options.build_v8_with_gn)
-
-
-def configure_openssl(o):
-  variables = o['variables']
-  variables['node_use_openssl'] = b(not options.without_ssl)
-  variables['node_shared_openssl'] = b(options.shared_openssl)
-  variables['openssl_no_asm'] = 1 if options.openssl_no_asm else 0
-  variables['openssl_fips'] = ''
-
-  if options.without_ssl:
-    def without_ssl_error(option):
-      error('--without-ssl is incompatible with %s' % option)
-    if options.shared_openssl:
-      without_ssl_error('--shared-openssl')
-    if options.openssl_no_asm:
-      without_ssl_error('--openssl-no-asm')
-    if options.openssl_fips:
-      without_ssl_error('--openssl-fips')
-    return
-
-  if options.use_openssl_ca_store:
-    o['defines'] += ['NODE_OPENSSL_CERT_STORE']
-  if options.openssl_system_ca_path:
-    variables['openssl_system_ca_path'] = options.openssl_system_ca_path
-  variables['node_without_node_options'] = b(options.without_node_options)
-  if options.without_node_options:
-      o['defines'] += ['NODE_WITHOUT_NODE_OPTIONS']
-
-  if not options.shared_openssl and not options.openssl_no_asm:
-    is_x86 = 'x64' in variables['target_arch'] or 'ia32' in variables['target_arch']
-
-    # supported asm compiler for AVX2. See https://github.com/openssl/openssl/
-    # blob/OpenSSL_1_1_0-stable/crypto/modes/asm/aesni-gcm-x86_64.pl#L52-L69
-    openssl110_asm_supported = \
-      ('gas_version' in variables and float(variables['gas_version']) >= 2.23) or \
-      ('xcode_version' in variables and float(variables['xcode_version']) >= 5.0) or \
-      ('llvm_version' in variables and float(variables['llvm_version']) >= 3.3) or \
-      ('nasm_version' in variables and float(variables['nasm_version']) >= 2.10)
-
-    if is_x86 and not openssl110_asm_supported:
-      error('''Did not find a new enough assembler, install one or build with
-       --openssl-no-asm.
-       Please refer to BUILDING.md''')
-
-  elif options.openssl_no_asm:
-    warn('''--openssl-no-asm will result in binaries that do not take advantage
-         of modern CPU cryptographic instructions and will therefore be slower.
-         Please refer to BUILDING.md''')
-
-  if options.openssl_no_asm and options.shared_openssl:
-    error('--openssl-no-asm is incompatible with --shared-openssl')
-
-  if options.openssl_fips:
-     error('FIPS is not supported in this version of Node.js')
-
-  configure_library('openssl', o)
-
-
-def configure_static(o):
-  if options.fully_static or options.partly_static:
-    if flavor == 'mac':
-      print("Generation of static executable will not work on OSX "
-            "when using the default compilation environment")
-      return
-
-    if options.fully_static:
-      o['libraries'] += ['-static']
-    elif options.partly_static:
-      o['libraries'] += ['-static-libgcc', '-static-libstdc++']
-      if options.enable_asan:
-        o['libraries'] += ['-static-libasan']
-
-
-def write(filename, data):
-  filename = filename
-  print('creating %s' % filename)
-  f = open(filename, 'w+')
-  f.write(data)
-
-do_not_edit = '# Do not edit. Generated by the configure script.\n'
-
-def glob_to_var(dir_base, dir_sub, patch_dir):
-  list = []
-  dir_all = '%s/%s' % (dir_base, dir_sub)
-  files = os.walk(dir_all)
-  for ent in files:
-    (path, dirs, files) = ent
-    for file in files:
-      if file.endswith('.cpp') or file.endswith('.c') or file.endswith('.h'):
-        # srcfile uses "slash" as dir separator as its output is consumed by gyp
-        srcfile = '%s/%s' % (dir_sub, file)
-        if patch_dir:
-          patchfile = '%s/%s/%s' % (dir_base, patch_dir, file)
-          if os.path.isfile(patchfile):
-            srcfile = '%s/%s' % (patch_dir, file)
-            print('Using version-specific floating patch %s' % patchfile)
-        list.append(srcfile)
-    break
-  return list
-
-def configure_intl(o):
-  icus = [
-    {
-      'url': 'https://sourceforge.net/projects/icu/files/ICU4C/62.1/icu4c-62_1-src.zip',
-      'md5': '408854f7b9b58311b68fab4b4dfc80be',
-    },
-  ]
-  def icu_download(path):
-    # download ICU, if needed
-    if not os.access(options.download_path, os.W_OK):
-      error('''Cannot write to desired download path.
-        Either create it or verify permissions.''')
-    for icu in icus:
-      url = icu['url']
-      md5 = icu['md5']
-      local = url.split('/')[-1]
-      targetfile = os.path.join(options.download_path, local)
-      if not os.path.isfile(targetfile):
-        if nodedownload.candownload(auto_downloads, "icu"):
-          nodedownload.retrievefile(url, targetfile)
-      else:
-        print('Re-using existing %s' % targetfile)
-      if os.path.isfile(targetfile):
-        print('Checking file integrity with MD5:\r')
-        gotmd5 = nodedownload.md5sum(targetfile)
-        print('MD5:      %s  %s' % (gotmd5, targetfile))
-        if (md5 == gotmd5):
-          return targetfile
-        else:
-          print('Expected: %s      *MISMATCH*' % md5)
-          print('\n ** Corrupted ZIP? Delete %s to retry download.\n' % targetfile)
-    return None
-  icu_config = {
-    'variables': {}
-  }
-  icu_config_name = 'icu_config.gypi'
-  def write_config(data, name):
-    return
-
-  # write an empty file to start with
-  write(icu_config_name, do_not_edit +
-        pprint.pformat(icu_config, indent=2) + '\n')
-
-  # always set icu_small, node.gyp depends on it being defined.
-  o['variables']['icu_small'] = b(False)
-
-  with_intl = options.with_intl
-  with_icu_source = options.with_icu_source
-  have_icu_path = bool(options.with_icu_path)
-  if have_icu_path and with_intl != 'none':
-    error('Cannot specify both --with-icu-path and --with-intl')
-  elif have_icu_path:
-    # Chromium .gyp mode: --with-icu-path
-    o['variables']['v8_enable_i18n_support'] = 1
-    # use the .gyp given
-    o['variables']['icu_gyp_path'] = options.with_icu_path
-    return
-  # --with-intl=<with_intl>
-  # set the default
-  if with_intl in (None, 'none'):
-    o['variables']['v8_enable_i18n_support'] = 0
-    return  # no Intl
-  elif with_intl == 'small-icu':
-    # small ICU (English only)
-    o['variables']['v8_enable_i18n_support'] = 1
-    o['variables']['icu_small'] = b(True)
-    locs = set(options.with_icu_locales.split(','))
-    locs.add('root')  # must have root
-    o['variables']['icu_locales'] = string.join(locs,',')
-    # We will check a bit later if we can use the canned deps/icu-small
-  elif with_intl == 'full-icu':
-    # full ICU
-    o['variables']['v8_enable_i18n_support'] = 1
-  elif with_intl == 'system-icu':
-    # ICU from pkg-config.
-    o['variables']['v8_enable_i18n_support'] = 1
-    pkgicu = pkg_config('icu-i18n')
-    if pkgicu[0] is None:
-      error('''Could not load pkg-config data for "icu-i18n".
-       See above errors or the README.md.''')
-    (libs, cflags, libpath) = pkgicu
-    # libpath provides linker path which may contain spaces
-    if libpath:
-      o['libraries'] += [libpath]
-    # safe to split, cannot contain spaces
-    o['libraries'] += libs.split()
-    if cflags:
-      o['include_dirs'] += filter(None, map(str.strip, cflags.split('-I')))
-    # use the "system" .gyp
-    o['variables']['icu_gyp_path'] = 'tools/icu/icu-system.gyp'
-    return
-
-  # this is just the 'deps' dir. Used for unpacking.
-  icu_parent_path = 'deps'
-
-  # The full path to the ICU source directory. Should not include './'.
-  icu_full_path = 'deps/icu'
-
-  # icu-tmp is used to download and unpack the ICU tarball.
-  icu_tmp_path = os.path.join(icu_parent_path, 'icu-tmp')
-
-  # canned ICU. see tools/icu/README.md to update.
-  canned_icu_dir = 'deps/icu-small'
-
-  # We can use 'deps/icu-small' - pre-canned ICU *iff*
-  # - with_intl == small-icu (the default!)
-  # - with_icu_locales == 'root,en' (the default!)
-  # - deps/icu-small exists!
-  # - with_icu_source is unset (i.e. no other ICU was specified)
-  # (Note that this is the *DEFAULT CASE*.)
-  #
-  # This is *roughly* equivalent to
-  # $ configure --with-intl=small-icu --with-icu-source=deps/icu-small
-  # .. Except that we avoid copying icu-small over to deps/icu.
-  # In this default case, deps/icu is ignored, although make clean will
-  # still harmlessly remove deps/icu.
-
-  # are we using default locales?
-  using_default_locales = ( options.with_icu_locales == icu_default_locales )
-
-  # make sure the canned ICU really exists
-  canned_icu_available = os.path.isdir(canned_icu_dir)
-
-  if (o['variables']['icu_small'] == b(True)) and using_default_locales and (not with_icu_source) and canned_icu_available:
-    # OK- we can use the canned ICU.
-    icu_config['variables']['icu_small_canned'] = 1
-    icu_full_path = canned_icu_dir
-
-  # --with-icu-source processing
-  # now, check that they didn't pass --with-icu-source=deps/icu
-  elif with_icu_source and os.path.abspath(icu_full_path) == os.path.abspath(with_icu_source):
-    print('Ignoring redundant --with-icu-source=%s' % with_icu_source)
-    with_icu_source = None
-  # if with_icu_source is still set, try to use it.
-  if with_icu_source:
-    if os.path.isdir(icu_full_path):
-      print('Deleting old ICU source: %s' % icu_full_path)
-      shutil.rmtree(icu_full_path)
-    # now, what path was given?
-    if os.path.isdir(with_icu_source):
-      # it's a path. Copy it.
-      print('%s -> %s' % (with_icu_source, icu_full_path))
-      shutil.copytree(with_icu_source, icu_full_path)
-    else:
-      # could be file or URL.
-      # Set up temporary area
-      if os.path.isdir(icu_tmp_path):
-        shutil.rmtree(icu_tmp_path)
-      os.mkdir(icu_tmp_path)
-      icu_tarball = None
-      if os.path.isfile(with_icu_source):
-        # it's a file. Try to unpack it.
-        icu_tarball = with_icu_source
-      else:
-        # Can we download it?
-        local = os.path.join(icu_tmp_path, with_icu_source.split('/')[-1])  # local part
-        icu_tarball = nodedownload.retrievefile(with_icu_source, local)
-      # continue with "icu_tarball"
-      nodedownload.unpack(icu_tarball, icu_tmp_path)
-      # Did it unpack correctly? Should contain 'icu'
-      tmp_icu = os.path.join(icu_tmp_path, 'icu')
-      if os.path.isdir(tmp_icu):
-        os.rename(tmp_icu, icu_full_path)
-        shutil.rmtree(icu_tmp_path)
-      else:
-        shutil.rmtree(icu_tmp_path)
-        error('--with-icu-source=%s did not result in an "icu" dir.' % \
-               with_icu_source)
-
-  # ICU mode. (icu-generic.gyp)
-  o['variables']['icu_gyp_path'] = 'tools/icu/icu-generic.gyp'
-  # ICU source dir relative to tools/icu (for .gyp file)
-  o['variables']['icu_path'] = icu_full_path
-  if not os.path.isdir(icu_full_path):
-    print('* ECMA-402 (Intl) support didn\'t find ICU in %s..' % icu_full_path)
-    # can we download (or find) a zipfile?
-    localzip = icu_download(icu_full_path)
-    if localzip:
-      nodedownload.unpack(localzip, icu_parent_path)
-  if not os.path.isdir(icu_full_path):
-    error('''Cannot build Intl without ICU in %s.
-       Fix, or disable with "--with-intl=none"''' % icu_full_path)
-  else:
-    print('* Using ICU in %s' % icu_full_path)
-  # Now, what version of ICU is it? We just need the "major", such as 54.
-  # uvernum.h contains it as a #define.
-  uvernum_h = os.path.join(icu_full_path, 'source/common/unicode/uvernum.h')
-  if not os.path.isfile(uvernum_h):
-    error('Could not load %s - is ICU installed?' % uvernum_h)
-  icu_ver_major = None
-  matchVerExp = r'^\s*#define\s+U_ICU_VERSION_SHORT\s+"([^"]*)".*'
-  match_version = re.compile(matchVerExp)
-  for line in open(uvernum_h).readlines():
-    m = match_version.match(line)
-    if m:
-      icu_ver_major = m.group(1)
-  if not icu_ver_major:
-    error('Could not read U_ICU_VERSION_SHORT version from %s' % uvernum_h)
-  icu_endianness = sys.byteorder[0];
-  o['variables']['icu_ver_major'] = icu_ver_major
-  o['variables']['icu_endianness'] = icu_endianness
-  icu_data_file_l = 'icudt%s%s.dat' % (icu_ver_major, 'l')
-  icu_data_file = 'icudt%s%s.dat' % (icu_ver_major, icu_endianness)
-  # relative to configure
-  icu_data_path = os.path.join(icu_full_path,
-                               'source/data/in',
-                               icu_data_file_l)
-  # relative to dep..
-  icu_data_in = os.path.join('..','..', icu_full_path, 'source/data/in', icu_data_file_l)
-  if not os.path.isfile(icu_data_path) and icu_endianness != 'l':
-    # use host endianness
-    icu_data_path = os.path.join(icu_full_path,
-                                 'source/data/in',
-                                 icu_data_file)
-    # relative to dep..
-    icu_data_in = os.path.join('..', icu_full_path, 'source/data/in',
-                               icu_data_file)
-  # this is the input '.dat' file to use .. icudt*.dat
-  # may be little-endian if from a icu-project.org tarball
-  o['variables']['icu_data_in'] = icu_data_in
-  if not os.path.isfile(icu_data_path):
-    # .. and we're not about to build it from .gyp!
-    error('''ICU prebuilt data file %s does not exist.
-       See the README.md.''' % icu_data_path)
-  # map from variable name to subdirs
-  icu_src = {
-    'stubdata': 'stubdata',
-    'common': 'common',
-    'i18n': 'i18n',
-    'tools': 'tools/toolutil',
-    'genccode': 'tools/genccode',
-    'genrb': 'tools/genrb',
-    'icupkg': 'tools/icupkg',
-  }
-  # this creates a variable icu_src_XXX for each of the subdirs
-  # with a list of the src files to use
-  for i in icu_src:
-    var  = 'icu_src_%s' % i
-    path = '../../%s/source/%s' % (icu_full_path, icu_src[i])
-    icu_config['variables'][var] = glob_to_var('tools/icu', path, 'patches/%s/source/%s' % (icu_ver_major, icu_src[i]) )
-  # write updated icu_config.gypi with a bunch of paths
-  write(icu_config_name, do_not_edit +
-        pprint.pformat(icu_config, indent=2) + '\n')
-  return  # end of configure_intl
-
-def configure_inspector(o):
-  disable_inspector = (options.without_inspector or
-                       options.with_intl in (None, 'none') or
-                       options.without_ssl)
-  o['variables']['v8_enable_inspector'] = 0 if disable_inspector else 1
-
-
-def make_bin_override():
-  if sys.platform == 'win32':
-    raise Exception('make_bin_override should not be called on win32.')
-  # If the system python is not the python we are running (which should be
-  # python 2), then create a directory with a symlink called `python` to our
-  # sys.executable. This directory will be prefixed to the PATH, so that
-  # other tools that shell out to `python` will use the appropriate python
-
-  which_python = which('python')
-  if (which_python and
-      os.path.realpath(which_python) == os.path.realpath(sys.executable)):
-    return
-
-  bin_override = os.path.abspath('out/tools/bin')
-  try:
-    os.makedirs(bin_override)
-  except OSError as e:
-    if e.errno != errno.EEXIST: raise e
-
-  python_link = os.path.join(bin_override, 'python')
-  try:
-    os.unlink(python_link)
-  except OSError as e:
-    if e.errno != errno.ENOENT: raise e
-  os.symlink(sys.executable, python_link)
-
-  # We need to set the environment right now so that when gyp (in run_gyp)
-  # shells out, it finds the right python (specifically at
-  # https://github.com/nodejs/node/blob/d82e107/deps/v8/gypfiles/toolchain.gypi#L43)
-  os.environ['PATH'] = bin_override + ':' + os.environ['PATH']
-
-  return bin_override
-
-output = {
-  'variables': {},
-  'include_dirs': [],
-  'libraries': [],
-  'defines': [],
-  'cflags': [],
-}
-
-# Print a warning when the compiler is too old.
-check_compiler(output)
-
-# determine the "flavor" (operating system) we're building for,
-# leveraging gyp's GetFlavor function
-flavor_params = {}
-if (options.dest_os):
-  flavor_params['flavor'] = options.dest_os
-flavor = GetFlavor(flavor_params)
-
-configure_node(output)
-configure_library('zlib', output)
-configure_library('http_parser', output)
-configure_library('libuv', output)
-configure_library('libcares', output)
-configure_library('nghttp2', output)
-# stay backwards compatible with shared cares builds
-output['variables']['node_shared_cares'] = \
-    output['variables'].pop('node_shared_libcares')
-configure_v8(output)
-configure_openssl(output)
-configure_intl(output)
-configure_static(output)
-configure_inspector(output)
-
-# variables should be a root level element,
-# move everything else to target_defaults
-variables = output['variables']
-del output['variables']
-
-# make_global_settings for special FIPS linking
-# should not be used to compile modules in node-gyp
-config_fips = { 'make_global_settings' : [] }
-if 'make_fips_settings' in output:
-  config_fips['make_global_settings'] = output['make_fips_settings']
-  del output['make_fips_settings']
-  write('config_fips.gypi', do_not_edit +
-        pprint.pformat(config_fips, indent=2) + '\n')
-
-# make_global_settings should be a root level element too
-if 'make_global_settings' in output:
-  make_global_settings = output['make_global_settings']
-  del output['make_global_settings']
-else:
-  make_global_settings = False
-
-output = {
-  'variables': variables,
-  'target_defaults': output,
-}
-if make_global_settings:
-  output['make_global_settings'] = make_global_settings
-
-pprint.pprint(output, indent=2)
-
-write('config.gypi', do_not_edit +
-      pprint.pformat(output, indent=2) + '\n')
-
-write('config.status', '#!/bin/sh\nset -x\nexec ./configure ' +
-      ' '.join([pipes.quote(arg) for arg in original_argv]) + '\n')
-os.chmod('config.status', 0o775)
-
-config = {
-  'BUILDTYPE': 'Debug' if options.debug else 'Release',
-  'PYTHON': sys.executable,
-  'NODE_TARGET_TYPE': variables['node_target_type'],
-}
-
-if options.prefix:
-  config['PREFIX'] = options.prefix
-
-config = '\n'.join(map('='.join, config.iteritems())) + '\n'
-
-# On Windows there's no reason to search for a different python binary.
-bin_override = None if sys.platform == 'win32' else make_bin_override()
-if bin_override:
-  config = 'export PATH:=' + bin_override + ':$(PATH)\n' + config
-
-write('config.mk', do_not_edit + config)
-
-gyp_args = ['--no-parallel']
-
-if options.use_ninja:
-  gyp_args += ['-f', 'ninja']
-elif flavor == 'win' and sys.platform != 'msys':
-  gyp_args += ['-f', 'msvs', '-G', 'msvs_version=auto']
-else:
-  gyp_args += ['-f', 'make-' + flavor]
-
-if options.compile_commands_json:
-  gyp_args += ['-f', 'compile_commands_json']
-
-gyp_args += args
-
-if warn.warned:
-  warn('warnings were emitted in the configure phase')
-
-run_gyp(gyp_args)
+import configure
diff --git a/configure.py b/configure.py
new file mode 100755
index 00000000000000..da696a92b48c1a
--- /dev/null
+++ b/configure.py
@@ -0,0 +1,1647 @@
+import sys
+import errno
+import optparse
+import os
+import pipes
+import pprint
+import re
+import shlex
+import subprocess
+import shutil
+import string
+from distutils.spawn import find_executable as which
+
+# If not run from node/, cd to node/.
+os.chdir(os.path.dirname(__file__) or '.')
+
+original_argv = sys.argv[1:]
+
+# gcc and g++ as defaults matches what GYP's Makefile generator does,
+# except on OS X.
+CC = os.environ.get('CC', 'cc' if sys.platform == 'darwin' else 'gcc')
+CXX = os.environ.get('CXX', 'c++' if sys.platform == 'darwin' else 'g++')
+
+sys.path.insert(0, os.path.join('tools', 'gyp', 'pylib'))
+from gyp.common import GetFlavor
+
+# imports in tools/configure.d
+sys.path.insert(0, os.path.join('tools', 'configure.d'))
+import nodedownload
+
+# imports in tools/
+sys.path.insert(0, 'tools')
+import getmoduleversion
+from gyp_node import run_gyp
+
+# imports in deps/v8/tools/node
+sys.path.insert(0, os.path.join('deps', 'v8', 'tools', 'node'))
+from fetch_deps import FetchDeps
+
+# parse our options
+parser = optparse.OptionParser()
+
+valid_os = ('win', 'mac', 'solaris', 'freebsd', 'openbsd', 'linux',
+            'android', 'aix', 'cloudabi')
+valid_arch = ('arm', 'arm64', 'ia32', 'mips', 'mipsel', 'mips64el', 'ppc',
+              'ppc64', 'x32','x64', 'x86', 'x86_64', 's390', 's390x')
+valid_arm_float_abi = ('soft', 'softfp', 'hard')
+valid_arm_fpu = ('vfp', 'vfpv3', 'vfpv3-d16', 'neon')
+valid_mips_arch = ('loongson', 'r1', 'r2', 'r6', 'rx')
+valid_mips_fpu = ('fp32', 'fp64', 'fpxx')
+valid_mips_float_abi = ('soft', 'hard')
+valid_intl_modes = ('none', 'small-icu', 'full-icu', 'system-icu')
+
+# create option groups
+shared_optgroup = optparse.OptionGroup(parser, "Shared libraries",
+    "Flags that allows you to control whether you want to build against "
+    "built-in dependencies or its shared representations. If necessary, "
+    "provide multiple libraries with comma.")
+intl_optgroup = optparse.OptionGroup(parser, "Internationalization",
+    "Flags that lets you enable i18n features in Node.js as well as which "
+    "library you want to build against.")
+http2_optgroup = optparse.OptionGroup(parser, "HTTP2",
+    "Flags that allows you to control HTTP2 features in Node.js")
+
+# Options should be in alphabetical order but keep --prefix at the top,
+# that's arguably the one people will be looking for most.
+parser.add_option('--prefix',
+    action='store',
+    dest='prefix',
+    default='/usr/local',
+    help='select the install prefix [default: %default]')
+
+parser.add_option('--coverage',
+    action='store_true',
+    dest='coverage',
+    help='Build node with code coverage enabled')
+
+parser.add_option('--debug',
+    action='store_true',
+    dest='debug',
+    help='also build debug build')
+
+parser.add_option('--dest-cpu',
+    action='store',
+    dest='dest_cpu',
+    choices=valid_arch,
+    help='CPU architecture to build for ({0})'.format(', '.join(valid_arch)))
+
+parser.add_option('--cross-compiling',
+    action='store_true',
+    dest='cross_compiling',
+    default=None,
+    help='force build to be considered as cross compiled')
+parser.add_option('--no-cross-compiling',
+    action='store_false',
+    dest='cross_compiling',
+    default=None,
+    help='force build to be considered as NOT cross compiled')
+
+parser.add_option('--dest-os',
+    action='store',
+    dest='dest_os',
+    choices=valid_os,
+    help='operating system to build for ({0})'.format(', '.join(valid_os)))
+
+parser.add_option('--gdb',
+    action='store_true',
+    dest='gdb',
+    help='add gdb support')
+
+parser.add_option('--no-ifaddrs',
+    action='store_true',
+    dest='no_ifaddrs',
+    help='use on deprecated SunOS systems that do not support ifaddrs.h')
+
+parser.add_option("--fully-static",
+    action="store_true",
+    dest="fully_static",
+    help="Generate an executable without external dynamic libraries. This "
+         "will not work on OSX when using the default compilation environment")
+
+parser.add_option("--partly-static",
+    action="store_true",
+    dest="partly_static",
+    help="Generate an executable with libgcc and libstdc++ libraries. This "
+         "will not work on OSX when using the default compilation environment")
+
+parser.add_option("--enable-vtune-profiling",
+    action="store_true",
+    dest="enable_vtune_profiling",
+    help="Enable profiling support for Intel VTune profiler to profile "
+         "JavaScript code executed in nodejs. This feature is only available "
+         "for x32, x86, and x64 architectures.")
+
+parser.add_option("--enable-pgo-generate",
+    action="store_true",
+    dest="enable_pgo_generate",
+    help="Enable profiling with pgo of a binary. This feature is only available "
+         "on linux with gcc and g++ 5.4.1 or newer.")
+
+parser.add_option("--enable-pgo-use",
+    action="store_true",
+    dest="enable_pgo_use",
+    help="Enable use of the profile generated with --enable-pgo-generate. This "
+         "feature is only available on linux with gcc and g++ 5.4.1 or newer.")
+
+parser.add_option("--enable-lto",
+    action="store_true",
+    dest="enable_lto",
+    help="Enable compiling with lto of a binary. This feature is only available "
+         "on linux with gcc and g++ 5.4.1 or newer.")
+
+parser.add_option("--link-module",
+    action="append",
+    dest="linked_module",
+    help="Path to a JS file to be bundled in the binary as a builtin. "
+         "This module will be referenced by path without extension; "
+         "e.g. /root/x/y.js will be referenced via require('root/x/y'). "
+         "Can be used multiple times")
+
+parser.add_option("--openssl-no-asm",
+    action="store_true",
+    dest="openssl_no_asm",
+    help="Do not build optimized assembly for OpenSSL")
+
+parser.add_option('--openssl-fips',
+    action='store',
+    dest='openssl_fips',
+    help='Build OpenSSL using FIPS canister .o file in supplied folder')
+
+parser.add_option('--openssl-use-def-ca-store',
+    action='store_true',
+    dest='use_openssl_ca_store',
+    help='Use OpenSSL supplied CA store instead of compiled-in Mozilla CA copy.')
+
+parser.add_option('--openssl-system-ca-path',
+    action='store',
+    dest='openssl_system_ca_path',
+    help='Use the specified path to system CA (PEM format) in addition to '
+         'the OpenSSL supplied CA store or compiled-in Mozilla CA copy.')
+
+shared_optgroup.add_option('--shared-http-parser',
+    action='store_true',
+    dest='shared_http_parser',
+    help='link to a shared http_parser DLL instead of static linking')
+
+shared_optgroup.add_option('--shared-http-parser-includes',
+    action='store',
+    dest='shared_http_parser_includes',
+    help='directory containing http_parser header files')
+
+shared_optgroup.add_option('--shared-http-parser-libname',
+    action='store',
+    dest='shared_http_parser_libname',
+    default='http_parser',
+    help='alternative lib name to link to [default: %default]')
+
+shared_optgroup.add_option('--shared-http-parser-libpath',
+    action='store',
+    dest='shared_http_parser_libpath',
+    help='a directory to search for the shared http_parser DLL')
+
+shared_optgroup.add_option('--shared-libuv',
+    action='store_true',
+    dest='shared_libuv',
+    help='link to a shared libuv DLL instead of static linking')
+
+shared_optgroup.add_option('--shared-libuv-includes',
+    action='store',
+    dest='shared_libuv_includes',
+    help='directory containing libuv header files')
+
+shared_optgroup.add_option('--shared-libuv-libname',
+    action='store',
+    dest='shared_libuv_libname',
+    default='uv',
+    help='alternative lib name to link to [default: %default]')
+
+shared_optgroup.add_option('--shared-libuv-libpath',
+    action='store',
+    dest='shared_libuv_libpath',
+    help='a directory to search for the shared libuv DLL')
+
+shared_optgroup.add_option('--shared-nghttp2',
+    action='store_true',
+    dest='shared_nghttp2',
+    help='link to a shared nghttp2 DLL instead of static linking')
+
+shared_optgroup.add_option('--shared-nghttp2-includes',
+    action='store',
+    dest='shared_nghttp2_includes',
+    help='directory containing nghttp2 header files')
+
+shared_optgroup.add_option('--shared-nghttp2-libname',
+    action='store',
+    dest='shared_nghttp2_libname',
+    default='nghttp2',
+    help='alternative lib name to link to [default: %default]')
+
+shared_optgroup.add_option('--shared-nghttp2-libpath',
+    action='store',
+    dest='shared_nghttp2_libpath',
+    help='a directory to search for the shared nghttp2 DLLs')
+
+shared_optgroup.add_option('--shared-openssl',
+    action='store_true',
+    dest='shared_openssl',
+    help='link to a shared OpenSSl DLL instead of static linking')
+
+shared_optgroup.add_option('--shared-openssl-includes',
+    action='store',
+    dest='shared_openssl_includes',
+    help='directory containing OpenSSL header files')
+
+shared_optgroup.add_option('--shared-openssl-libname',
+    action='store',
+    dest='shared_openssl_libname',
+    default='crypto,ssl',
+    help='alternative lib name to link to [default: %default]')
+
+shared_optgroup.add_option('--shared-openssl-libpath',
+    action='store',
+    dest='shared_openssl_libpath',
+    help='a directory to search for the shared OpenSSL DLLs')
+
+shared_optgroup.add_option('--shared-zlib',
+    action='store_true',
+    dest='shared_zlib',
+    help='link to a shared zlib DLL instead of static linking')
+
+shared_optgroup.add_option('--shared-zlib-includes',
+    action='store',
+    dest='shared_zlib_includes',
+    help='directory containing zlib header files')
+
+shared_optgroup.add_option('--shared-zlib-libname',
+    action='store',
+    dest='shared_zlib_libname',
+    default='z',
+    help='alternative lib name to link to [default: %default]')
+
+shared_optgroup.add_option('--shared-zlib-libpath',
+    action='store',
+    dest='shared_zlib_libpath',
+    help='a directory to search for the shared zlib DLL')
+
+shared_optgroup.add_option('--shared-cares',
+    action='store_true',
+    dest='shared_libcares',
+    help='link to a shared cares DLL instead of static linking')
+
+shared_optgroup.add_option('--shared-cares-includes',
+    action='store',
+    dest='shared_libcares_includes',
+    help='directory containing cares header files')
+
+shared_optgroup.add_option('--shared-cares-libname',
+    action='store',
+    dest='shared_libcares_libname',
+    default='cares',
+    help='alternative lib name to link to [default: %default]')
+
+shared_optgroup.add_option('--shared-cares-libpath',
+    action='store',
+    dest='shared_libcares_libpath',
+    help='a directory to search for the shared cares DLL')
+
+parser.add_option_group(shared_optgroup)
+
+parser.add_option('--systemtap-includes',
+    action='store',
+    dest='systemtap_includes',
+    help='directory containing systemtap header files')
+
+parser.add_option('--tag',
+    action='store',
+    dest='tag',
+    help='custom build tag')
+
+parser.add_option('--release-urlbase',
+    action='store',
+    dest='release_urlbase',
+    help='Provide a custom URL prefix for the `process.release` properties '
+         '`sourceUrl` and `headersUrl`. When compiling a release build, this '
+         'will default to https://nodejs.org/download/release/')
+
+parser.add_option('--enable-d8',
+    action='store_true',
+    dest='enable_d8',
+    help=optparse.SUPPRESS_HELP)  # Unsupported, undocumented.
+
+parser.add_option('--enable-trace-maps',
+    action='store_true',
+    dest='trace_maps',
+    help='Enable the --trace-maps flag in V8 (use at your own risk)')
+
+parser.add_option('--v8-options',
+    action='store',
+    dest='v8_options',
+    help='v8 options to pass, see `node --v8-options` for examples.')
+
+parser.add_option('--with-arm-float-abi',
+    action='store',
+    dest='arm_float_abi',
+    choices=valid_arm_float_abi,
+    help='specifies which floating-point ABI to use ({0}).'.format(
+        ', '.join(valid_arm_float_abi)))
+
+parser.add_option('--with-arm-fpu',
+    action='store',
+    dest='arm_fpu',
+    choices=valid_arm_fpu,
+    help='ARM FPU mode ({0}) [default: %default]'.format(
+        ', '.join(valid_arm_fpu)))
+
+parser.add_option('--with-mips-arch-variant',
+    action='store',
+    dest='mips_arch_variant',
+    default='r2',
+    choices=valid_mips_arch,
+    help='MIPS arch variant ({0}) [default: %default]'.format(
+        ', '.join(valid_mips_arch)))
+
+parser.add_option('--with-mips-fpu-mode',
+    action='store',
+    dest='mips_fpu_mode',
+    default='fp32',
+    choices=valid_mips_fpu,
+    help='MIPS FPU mode ({0}) [default: %default]'.format(
+        ', '.join(valid_mips_fpu)))
+
+parser.add_option('--with-mips-float-abi',
+    action='store',
+    dest='mips_float_abi',
+    default='hard',
+    choices=valid_mips_float_abi,
+    help='MIPS floating-point ABI ({0}) [default: %default]'.format(
+        ', '.join(valid_mips_float_abi)))
+
+parser.add_option('--with-dtrace',
+    action='store_true',
+    dest='with_dtrace',
+    help='build with DTrace (default is true on sunos and darwin)')
+
+parser.add_option('--with-etw',
+    action='store_true',
+    dest='with_etw',
+    help='build with ETW (default is true on Windows)')
+
+intl_optgroup.add_option('--with-intl',
+    action='store',
+    dest='with_intl',
+    default='small-icu',
+    choices=valid_intl_modes,
+    help='Intl mode (valid choices: {0}) [default: %default]'.format(
+        ', '.join(valid_intl_modes)))
+
+intl_optgroup.add_option('--without-intl',
+    action='store_const',
+    dest='with_intl',
+    const='none',
+    help='Disable Intl, same as --with-intl=none (disables inspector)')
+
+intl_optgroup.add_option('--with-icu-path',
+    action='store',
+    dest='with_icu_path',
+    help='Path to icu.gyp (ICU i18n, Chromium version only.)')
+
+icu_default_locales='root,en'
+
+intl_optgroup.add_option('--with-icu-locales',
+    action='store',
+    dest='with_icu_locales',
+    default=icu_default_locales,
+    help='Comma-separated list of locales for "small-icu". "root" is assumed. '
+        '[default: %default]')
+
+intl_optgroup.add_option('--with-icu-source',
+    action='store',
+    dest='with_icu_source',
+    help='Intl mode: optional local path to icu/ dir, or path/URL of icu source archive.')
+
+parser.add_option('--with-ltcg',
+    action='store_true',
+    dest='with_ltcg',
+    help='Use Link Time Code Generation. This feature is only available on Windows.')
+
+parser.add_option('--with-pch',
+    action='store_true',
+    dest='with_pch',
+    help='Use Precompiled Headers (only available on Windows).')
+
+intl_optgroup.add_option('--download',
+    action='store',
+    dest='download_list',
+    help=nodedownload.help())
+
+intl_optgroup.add_option('--download-path',
+    action='store',
+    dest='download_path',
+    default='deps',
+    help='Download directory [default: %default]')
+
+parser.add_option_group(intl_optgroup)
+
+parser.add_option('--debug-lib',
+    action='store_true',
+    dest='node_debug_lib',
+    help='build lib with DCHECK macros')
+
+http2_optgroup.add_option('--debug-nghttp2',
+    action='store_true',
+    dest='debug_nghttp2',
+    help='build nghttp2 with DEBUGBUILD (default is false)')
+
+parser.add_option_group(http2_optgroup)
+
+parser.add_option('--with-perfctr',
+    action='store_true',
+    dest='with_perfctr',
+    help='build with performance counters (default is true on Windows)')
+
+parser.add_option('--without-dtrace',
+    action='store_true',
+    dest='without_dtrace',
+    help='build without DTrace')
+
+parser.add_option('--without-etw',
+    action='store_true',
+    dest='without_etw',
+    help='build without ETW')
+
+parser.add_option('--without-npm',
+    action='store_true',
+    dest='without_npm',
+    help='do not install the bundled npm (package manager)')
+
+parser.add_option('--without-perfctr',
+    action='store_true',
+    dest='without_perfctr',
+    help='build without performance counters')
+
+# Dummy option for backwards compatibility
+parser.add_option('--with-snapshot',
+    action='store_true',
+    dest='unused_with_snapshot',
+    help=optparse.SUPPRESS_HELP)
+
+parser.add_option('--without-snapshot',
+    action='store_true',
+    dest='without_snapshot',
+    help=optparse.SUPPRESS_HELP)
+
+parser.add_option('--code-cache-path',
+    action='store',
+    dest='code_cache_path',
+    help='Use a file generated by tools/generate_code_cache.js to compile the'
+         ' code cache for builtin modules into the binary')
+
+parser.add_option('--without-ssl',
+    action='store_true',
+    dest='without_ssl',
+    help='build without SSL (disables crypto, https, inspector, etc.)')
+
+parser.add_option('--without-node-options',
+    action='store_true',
+    dest='without_node_options',
+    help='build without NODE_OPTIONS support')
+
+parser.add_option('--ninja',
+    action='store_true',
+    dest='use_ninja',
+    help='generate build files for use with Ninja')
+
+parser.add_option('--enable-asan',
+    action='store_true',
+    dest='enable_asan',
+    help='build with asan')
+
+parser.add_option('--enable-static',
+    action='store_true',
+    dest='enable_static',
+    help='build as static library')
+
+parser.add_option('--no-browser-globals',
+    action='store_true',
+    dest='no_browser_globals',
+    help='do not export browser globals like setTimeout, console, etc. ' +
+         '(This mode is not officially supported for regular applications)')
+
+parser.add_option('--without-inspector',
+    action='store_true',
+    dest='without_inspector',
+    help='disable the V8 inspector protocol')
+
+parser.add_option('--shared',
+    action='store_true',
+    dest='shared',
+    help='compile shared library for embedding node in another project. ' +
+         '(This mode is not officially supported for regular applications)')
+
+parser.add_option('--without-v8-platform',
+    action='store_true',
+    dest='without_v8_platform',
+    default=False,
+    help='do not initialize v8 platform during node.js startup. ' +
+         '(This mode is not officially supported for regular applications)')
+
+parser.add_option('--without-bundled-v8',
+    action='store_true',
+    dest='without_bundled_v8',
+    default=False,
+    help='do not use V8 includes from the bundled deps folder. ' +
+         '(This mode is not officially supported for regular applications)')
+
+parser.add_option('--build-v8-with-gn',
+    action='store_true',
+    dest='build_v8_with_gn',
+    default=False,
+    help='build V8 using GN instead of gyp')
+
+parser.add_option('--verbose',
+    action='store_true',
+    dest='verbose',
+    default=False,
+    help='get more output from this script')
+
+# Create compile_commands.json in out/Debug and out/Release.
+parser.add_option('-C',
+    action='store_true',
+    dest='compile_commands_json',
+    help=optparse.SUPPRESS_HELP)
+
+(options, args) = parser.parse_args()
+
+# Expand ~ in the install prefix now, it gets written to multiple files.
+options.prefix = os.path.expanduser(options.prefix or '')
+
+# set up auto-download list
+auto_downloads = nodedownload.parse(options.download_list)
+
+
+def error(msg):
+  prefix = '\033[1m\033[31mERROR\033[0m' if os.isatty(1) else 'ERROR'
+  print('%s: %s' % (prefix, msg))
+  sys.exit(1)
+
+def warn(msg):
+  warn.warned = True
+  prefix = '\033[1m\033[93mWARNING\033[0m' if os.isatty(1) else 'WARNING'
+  print('%s: %s' % (prefix, msg))
+
+# track if warnings occurred
+warn.warned = False
+
+def print_verbose(x):
+  if not options.verbose:
+    return
+  if type(x) is str:
+    print x
+  else:
+    pprint.pprint(x, indent=2)
+
+def b(value):
+  """Returns the string 'true' if value is truthy, 'false' otherwise."""
+  if value:
+    return 'true'
+  else:
+    return 'false'
+
+
+def pkg_config(pkg):
+  pkg_config = os.environ.get('PKG_CONFIG', 'pkg-config')
+  retval = ()
+  for flag in ['--libs-only-l', '--cflags-only-I', '--libs-only-L']:
+    try:
+      proc = subprocess.Popen(
+          shlex.split(pkg_config) + ['--silence-errors', flag, pkg],
+          stdout=subprocess.PIPE)
+      val = proc.communicate()[0].strip()
+    except OSError as e:
+      if e.errno != errno.ENOENT: raise e  # Unexpected error.
+      return (None, None, None)  # No pkg-config/pkgconf installed.
+    retval += (val,)
+  return retval
+
+
+def try_check_compiler(cc, lang):
+  try:
+    proc = subprocess.Popen(shlex.split(cc) + ['-E', '-P', '-x', lang, '-'],
+                            stdin=subprocess.PIPE, stdout=subprocess.PIPE)
+  except OSError:
+    return (False, False, '', '')
+
+  proc.stdin.write('__clang__ __GNUC__ __GNUC_MINOR__ __GNUC_PATCHLEVEL__ '
+                   '__clang_major__ __clang_minor__ __clang_patchlevel__')
+
+  values = (proc.communicate()[0].split() + ['0'] * 7)[0:7]
+  is_clang = values[0] == '1'
+  gcc_version = tuple(values[1:1+3])
+  clang_version = tuple(values[4:4+3])
+
+  return (True, is_clang, clang_version, gcc_version)
+
+
+#
+# The version of asm compiler is needed for building openssl asm files.
+# See deps/openssl/openssl.gypi for detail.
+# Commands and regular expressions to obtain its version number are taken from
+# https://github.com/openssl/openssl/blob/OpenSSL_1_0_2-stable/crypto/sha/asm/sha512-x86_64.pl#L112-L129
+#
+def get_version_helper(cc, regexp):
+  try:
+    proc = subprocess.Popen(shlex.split(cc) + ['-v'], stdin=subprocess.PIPE,
+                            stderr=subprocess.PIPE, stdout=subprocess.PIPE)
+  except OSError:
+    error('''No acceptable C compiler found!
+
+       Please make sure you have a C compiler installed on your system and/or
+       consider adjusting the CC environment variable if you installed
+       it in a non-standard prefix.''')
+
+  match = re.search(regexp, proc.communicate()[1])
+
+  if match:
+    return match.group(2)
+  else:
+    return '0'
+
+def get_nasm_version(asm):
+  try:
+    proc = subprocess.Popen(shlex.split(asm) + ['-v'],
+                            stdin=subprocess.PIPE, stderr=subprocess.PIPE,
+                            stdout=subprocess.PIPE)
+  except OSError:
+    warn('''No acceptable ASM compiler found!
+         Please make sure you have installed NASM from http://www.nasm.us
+         and refer BUILDING.md.''')
+    return '0'
+
+  match = re.match(r"NASM version ([2-9]\.[0-9][0-9]+)",
+                   proc.communicate()[0])
+
+  if match:
+    return match.group(1)
+  else:
+    return '0'
+
+def get_llvm_version(cc):
+  return get_version_helper(
+    cc, r"(^(?:FreeBSD )?clang version|based on LLVM) ([3-9]\.[0-9]+)")
+
+def get_xcode_version(cc):
+  return get_version_helper(
+    cc, r"(^Apple LLVM version) ([0-9]+\.[0-9]+)")
+
+def get_gas_version(cc):
+  try:
+    custom_env = os.environ.copy()
+    custom_env["LC_ALL"] = "C"
+    proc = subprocess.Popen(shlex.split(cc) + ['-Wa,-v', '-c', '-o',
+                                               '/dev/null', '-x',
+                                               'assembler',  '/dev/null'],
+                            stdin=subprocess.PIPE, stderr=subprocess.PIPE,
+                            stdout=subprocess.PIPE, env=custom_env)
+  except OSError:
+    error('''No acceptable C compiler found!
+
+       Please make sure you have a C compiler installed on your system and/or
+       consider adjusting the CC environment variable if you installed
+       it in a non-standard prefix.''')
+
+  gas_ret = proc.communicate()[1]
+  match = re.match(r"GNU assembler version ([2-9]\.[0-9]+)", gas_ret)
+
+  if match:
+    return match.group(1)
+  else:
+    warn('Could not recognize `gas`: ' + gas_ret)
+    return '0'
+
+# Note: Apple clang self-reports as clang 4.2.0 and gcc 4.2.1.  It passes
+# the version check more by accident than anything else but a more rigorous
+# check involves checking the build number against a whitelist.  I'm not
+# quite prepared to go that far yet.
+def check_compiler(o):
+  if sys.platform == 'win32':
+    if not options.openssl_no_asm:
+      nasm_version = get_nasm_version('nasm')
+      o['variables']['nasm_version'] = nasm_version
+      if nasm_version == 0:
+        o['variables']['openssl_no_asm'] = 1
+    return
+
+  ok, is_clang, clang_version, gcc_version = try_check_compiler(CXX, 'c++')
+  if not ok:
+    warn('failed to autodetect C++ compiler version (CXX=%s)' % CXX)
+  elif clang_version < (3, 4, 2) if is_clang else gcc_version < (4, 9, 4):
+    warn('C++ compiler too old, need g++ 4.9.4 or clang++ 3.4.2 (CXX=%s)' % CXX)
+
+  ok, is_clang, clang_version, gcc_version = try_check_compiler(CC, 'c')
+  if not ok:
+    warn('failed to autodetect C compiler version (CC=%s)' % CC)
+  elif not is_clang and gcc_version < (4, 2, 0):
+    # clang 3.2 is a little white lie because any clang version will probably
+    # do for the C bits.  However, we might as well encourage people to upgrade
+    # to a version that is not completely ancient.
+    warn('C compiler too old, need gcc 4.2 or clang 3.2 (CC=%s)' % CC)
+
+  o['variables']['llvm_version'] = get_llvm_version(CC) if is_clang else 0
+
+  # Need xcode_version or gas_version when openssl asm files are compiled.
+  if options.without_ssl or options.openssl_no_asm or options.shared_openssl:
+    return
+
+  if is_clang:
+    if sys.platform == 'darwin':
+      o['variables']['xcode_version'] = get_xcode_version(CC)
+  else:
+    o['variables']['gas_version'] = get_gas_version(CC)
+
+
+def cc_macros(cc=None):
+  """Checks predefined macros using the C compiler command."""
+
+  try:
+    p = subprocess.Popen(shlex.split(cc or CC) + ['-dM', '-E', '-'],
+                         stdin=subprocess.PIPE,
+                         stdout=subprocess.PIPE,
+                         stderr=subprocess.PIPE)
+  except OSError:
+    error('''No acceptable C compiler found!
+
+       Please make sure you have a C compiler installed on your system and/or
+       consider adjusting the CC environment variable if you installed
+       it in a non-standard prefix.''')
+
+  p.stdin.write('\n')
+  out = p.communicate()[0]
+
+  out = str(out).split('\n')
+
+  k = {}
+  for line in out:
+    lst = shlex.split(line)
+    if len(lst) > 2:
+      key = lst[1]
+      val = lst[2]
+      k[key] = val
+  return k
+
+
+def is_arch_armv7():
+  """Check for ARMv7 instructions"""
+  cc_macros_cache = cc_macros()
+  return cc_macros_cache.get('__ARM_ARCH') == '7'
+
+
+def is_arch_armv6():
+  """Check for ARMv6 instructions"""
+  cc_macros_cache = cc_macros()
+  return cc_macros_cache.get('__ARM_ARCH') == '6'
+
+
+def is_arm_hard_float_abi():
+  """Check for hardfloat or softfloat eabi on ARM"""
+  # GCC versions 4.6 and above define __ARM_PCS or __ARM_PCS_VFP to specify
+  # the Floating Point ABI used (PCS stands for Procedure Call Standard).
+  # We use these as well as a couple of other defines to statically determine
+  # what FP ABI used.
+
+  return '__ARM_PCS_VFP' in cc_macros()
+
+
+def host_arch_cc():
+  """Host architecture check using the CC command."""
+
+  if sys.platform.startswith('aix'):
+    # we only support gcc at this point and the default on AIX
+    # would be xlc so hard code gcc
+    k = cc_macros('gcc')
+  else:
+    k = cc_macros(os.environ.get('CC_host'))
+
+  matchup = {
+    '__aarch64__' : 'arm64',
+    '__arm__'     : 'arm',
+    '__i386__'    : 'ia32',
+    '__MIPSEL__'  : 'mipsel',
+    '__mips__'    : 'mips',
+    '__PPC64__'   : 'ppc64',
+    '__PPC__'     : 'ppc64',
+    '__x86_64__'  : 'x64',
+    '__s390__'    : 's390',
+    '__s390x__'   : 's390x',
+  }
+
+  rtn = 'ia32' # default
+
+  for i in matchup:
+    if i in k and k[i] != '0':
+      rtn = matchup[i]
+      if rtn != 's390':
+        break
+
+  if rtn == 'mipsel' and '_LP64' in k:
+    rtn = 'mips64el'
+
+  return rtn
+
+
+def host_arch_win():
+  """Host architecture check using environ vars (better way to do this?)"""
+
+  observed_arch = os.environ.get('PROCESSOR_ARCHITECTURE', 'x86')
+  arch = os.environ.get('PROCESSOR_ARCHITEW6432', observed_arch)
+
+  matchup = {
+    'AMD64'  : 'x64',
+    'x86'    : 'ia32',
+    'arm'    : 'arm',
+    'mips'   : 'mips',
+  }
+
+  return matchup.get(arch, 'ia32')
+
+
+def configure_arm(o):
+  if options.arm_float_abi:
+    arm_float_abi = options.arm_float_abi
+  elif is_arm_hard_float_abi():
+    arm_float_abi = 'hard'
+  else:
+    arm_float_abi = 'default'
+
+  arm_fpu = 'vfp'
+
+  if is_arch_armv7():
+    arm_fpu = 'vfpv3'
+    o['variables']['arm_version'] = '7'
+  else:
+    o['variables']['arm_version'] = '6' if is_arch_armv6() else 'default'
+
+  o['variables']['arm_thumb'] = 0      # -marm
+  o['variables']['arm_float_abi'] = arm_float_abi
+
+  if options.dest_os == 'android':
+    arm_fpu = 'vfpv3'
+    o['variables']['arm_version'] = '7'
+
+  o['variables']['arm_fpu'] = options.arm_fpu or arm_fpu
+
+
+def configure_mips(o):
+  can_use_fpu_instructions = (options.mips_float_abi != 'soft')
+  o['variables']['v8_can_use_fpu_instructions'] = b(can_use_fpu_instructions)
+  o['variables']['v8_use_mips_abi_hardfloat'] = b(can_use_fpu_instructions)
+  o['variables']['mips_arch_variant'] = options.mips_arch_variant
+  o['variables']['mips_fpu_mode'] = options.mips_fpu_mode
+
+
+def gcc_version_ge(version_checked):
+  for compiler in [(CC, 'c'), (CXX, 'c++')]:
+    ok, is_clang, clang_version, compiler_version = \
+      try_check_compiler(compiler[0], compiler[1])
+    compiler_version_num = tuple(map(int, compiler_version))
+    if is_clang or compiler_version_num < version_checked:
+      return False
+  return True
+
+
+def configure_node(o):
+  if options.dest_os == 'android':
+    o['variables']['OS'] = 'android'
+  o['variables']['node_prefix'] = options.prefix
+  o['variables']['node_install_npm'] = b(not options.without_npm)
+  o['default_configuration'] = 'Debug' if options.debug else 'Release'
+
+  host_arch = host_arch_win() if os.name == 'nt' else host_arch_cc()
+  target_arch = options.dest_cpu or host_arch
+  # ia32 is preferred by the build tools (GYP) over x86 even if we prefer the latter
+  # the Makefile resets this to x86 afterward
+  if target_arch == 'x86':
+    target_arch = 'ia32'
+  # x86_64 is common across linuxes, allow it as an alias for x64
+  if target_arch == 'x86_64':
+    target_arch = 'x64'
+  o['variables']['host_arch'] = host_arch
+  o['variables']['target_arch'] = target_arch
+  o['variables']['node_byteorder'] = sys.byteorder
+
+  cross_compiling = (options.cross_compiling
+                     if options.cross_compiling is not None
+                     else target_arch != host_arch)
+  want_snapshots = not options.without_snapshot
+  o['variables']['want_separate_host_toolset'] = int(
+      cross_compiling and want_snapshots)
+
+  if target_arch == 'arm':
+    configure_arm(o)
+  elif target_arch in ('mips', 'mipsel', 'mips64el'):
+    configure_mips(o)
+
+  if flavor == 'aix':
+    o['variables']['node_target_type'] = 'static_library'
+
+  if target_arch in ('x86', 'x64', 'ia32', 'x32'):
+    o['variables']['node_enable_v8_vtunejit'] = b(options.enable_vtune_profiling)
+  elif options.enable_vtune_profiling:
+    raise Exception(
+       'The VTune profiler for JavaScript is only supported on x32, x86, and x64 '
+       'architectures.')
+  else:
+    o['variables']['node_enable_v8_vtunejit'] = 'false'
+
+  if flavor != 'linux' and (options.enable_pgo_generate or options.enable_pgo_use):
+    raise Exception(
+      'The pgo option is supported only on linux.')
+
+  if flavor == 'linux':
+    if options.enable_pgo_generate or options.enable_pgo_use:
+      version_checked = (5, 4, 1)
+      if not gcc_version_ge(version_checked):
+        version_checked_str = ".".join(map(str, version_checked))
+        raise Exception(
+          'The options --enable-pgo-generate and --enable-pgo-use '
+          'are supported for gcc and gxx %s or newer only.' % (version_checked_str))
+
+    if options.enable_pgo_generate and options.enable_pgo_use:
+      raise Exception(
+        'Only one of the --enable-pgo-generate or --enable-pgo-use options '
+        'can be specified at a time. You would like to use '
+        '--enable-pgo-generate first, profile node, and then recompile '
+        'with --enable-pgo-use')
+
+  o['variables']['enable_pgo_generate'] = b(options.enable_pgo_generate)
+  o['variables']['enable_pgo_use']      = b(options.enable_pgo_use)
+
+  if flavor != 'linux' and (options.enable_lto):
+    raise Exception(
+      'The lto option is supported only on linux.')
+
+  if flavor == 'linux':
+    if options.enable_lto:
+      version_checked = (5, 4, 1)
+      if not gcc_version_ge(version_checked):
+        version_checked_str = ".".join(map(str, version_checked))
+        raise Exception(
+          'The option --enable-lto is supported for gcc and gxx %s'
+          ' or newer only.' % (version_checked_str))
+
+  o['variables']['enable_lto'] = b(options.enable_lto)
+
+  if flavor in ('solaris', 'mac', 'linux', 'freebsd'):
+    use_dtrace = not options.without_dtrace
+    # Don't enable by default on linux and freebsd
+    if flavor in ('linux', 'freebsd'):
+      use_dtrace = options.with_dtrace
+
+    if flavor == 'linux':
+      if options.systemtap_includes:
+        o['include_dirs'] += [options.systemtap_includes]
+    o['variables']['node_use_dtrace'] = b(use_dtrace)
+  elif options.with_dtrace:
+    raise Exception(
+       'DTrace is currently only supported on SunOS, MacOS or Linux systems.')
+  else:
+    o['variables']['node_use_dtrace'] = 'false'
+
+  if options.no_ifaddrs:
+    o['defines'] += ['SUNOS_NO_IFADDRS']
+
+  # By default, enable ETW on Windows.
+  if flavor == 'win':
+    o['variables']['node_use_etw'] = b(not options.without_etw)
+  elif options.with_etw:
+    raise Exception('ETW is only supported on Windows.')
+  else:
+    o['variables']['node_use_etw'] = 'false'
+
+  # By default, enable Performance counters on Windows.
+  if flavor == 'win':
+    o['variables']['node_use_perfctr'] = b(not options.without_perfctr)
+  elif options.with_perfctr:
+    raise Exception('Performance counter is only supported on Windows.')
+  else:
+    o['variables']['node_use_perfctr'] = 'false'
+
+  o['variables']['node_with_ltcg'] = b(options.with_ltcg)
+  if flavor != 'win' and options.with_ltcg:
+    raise Exception('Link Time Code Generation is only supported on Windows.')
+
+  if flavor == 'win':
+    o['variables']['node_use_pch'] = b(options.with_pch)
+  else:
+    o['variables']['node_use_pch'] = 'false'
+
+  if options.tag:
+    o['variables']['node_tag'] = '-' + options.tag
+  else:
+    o['variables']['node_tag'] = ''
+
+  o['variables']['node_release_urlbase'] = options.release_urlbase or ''
+
+  if options.v8_options:
+    o['variables']['node_v8_options'] = options.v8_options.replace('"', '\\"')
+
+  if options.enable_static:
+    o['variables']['node_target_type'] = 'static_library'
+
+  o['variables']['node_debug_lib'] = b(options.node_debug_lib)
+
+  if options.debug_nghttp2:
+    o['variables']['debug_nghttp2'] = 1
+  else:
+    o['variables']['debug_nghttp2'] = 'false'
+
+  o['variables']['node_no_browser_globals'] = b(options.no_browser_globals)
+  if options.code_cache_path:
+    o['variables']['node_code_cache_path'] = options.code_cache_path
+  o['variables']['node_shared'] = b(options.shared)
+  node_module_version = getmoduleversion.get_version()
+
+  if sys.platform == 'darwin':
+    shlib_suffix = '%s.dylib'
+  elif sys.platform.startswith('aix'):
+    shlib_suffix = '%s.a'
+  else:
+    shlib_suffix = 'so.%s'
+
+  shlib_suffix %= node_module_version
+  o['variables']['node_module_version'] = int(node_module_version)
+  o['variables']['shlib_suffix'] = shlib_suffix
+
+  if options.linked_module:
+    o['variables']['library_files'] = options.linked_module
+
+  o['variables']['asan'] = int(options.enable_asan or 0)
+
+  if options.coverage:
+    o['variables']['coverage'] = 'true'
+  else:
+    o['variables']['coverage'] = 'false'
+
+  if options.shared:
+    o['variables']['node_target_type'] = 'shared_library'
+  elif options.enable_static:
+    o['variables']['node_target_type'] = 'static_library'
+  else:
+    o['variables']['node_target_type'] = 'executable'
+
+def configure_library(lib, output):
+  shared_lib = 'shared_' + lib
+  output['variables']['node_' + shared_lib] = b(getattr(options, shared_lib))
+
+  if getattr(options, shared_lib):
+    (pkg_libs, pkg_cflags, pkg_libpath) = pkg_config(lib)
+
+    if options.__dict__[shared_lib + '_includes']:
+      output['include_dirs'] += [options.__dict__[shared_lib + '_includes']]
+    elif pkg_cflags:
+      output['include_dirs'] += (
+          filter(None, map(str.strip, pkg_cflags.split('-I'))))
+
+    # libpath needs to be provided ahead libraries
+    if options.__dict__[shared_lib + '_libpath']:
+      if flavor == 'win':
+        if 'msvs_settings' not in output:
+          output['msvs_settings'] = { 'VCLinkerTool': { 'AdditionalOptions': [] } }
+        output['msvs_settings']['VCLinkerTool']['AdditionalOptions'] += [
+          '/LIBPATH:%s' % options.__dict__[shared_lib + '_libpath']]
+      else:
+        output['libraries'] += [
+            '-L%s' % options.__dict__[shared_lib + '_libpath']]
+    elif pkg_libpath:
+      output['libraries'] += [pkg_libpath]
+
+    default_libs = getattr(options, shared_lib + '_libname')
+    default_libs = map('-l{0}'.format, default_libs.split(','))
+
+    if default_libs:
+      output['libraries'] += default_libs
+    elif pkg_libs:
+      output['libraries'] += pkg_libs.split()
+
+
+def configure_v8(o):
+  o['variables']['v8_enable_gdbjit'] = 1 if options.gdb else 0
+  o['variables']['v8_no_strict_aliasing'] = 1  # Work around compiler bugs.
+  o['variables']['v8_optimized_debug'] = 0  # Compile with -O0 in debug builds.
+  o['variables']['v8_random_seed'] = 0  # Use a random seed for hash tables.
+  o['variables']['v8_promise_internal_field_count'] = 1 # Add internal field to promises for async hooks.
+  o['variables']['v8_use_snapshot'] = 'false' if options.without_snapshot else 'true'
+  o['variables']['v8_trace_maps'] = 1 if options.trace_maps else 0
+  o['variables']['node_use_v8_platform'] = b(not options.without_v8_platform)
+  o['variables']['node_use_bundled_v8'] = b(not options.without_bundled_v8)
+  o['variables']['force_dynamic_crt'] = 1 if options.shared else 0
+  o['variables']['node_enable_d8'] = b(options.enable_d8)
+  # Unconditionally force typed arrays to allocate outside the v8 heap. This
+  # is to prevent memory pointers from being moved around that are returned by
+  # Buffer::Data().
+  o['variables']['v8_typed_array_max_size_in_heap'] = 0
+  if options.enable_d8:
+    o['variables']['test_isolation_mode'] = 'noop'  # Needed by d8.gyp.
+  if options.without_bundled_v8 and options.enable_d8:
+    raise Exception('--enable-d8 is incompatible with --without-bundled-v8.')
+  if options.without_bundled_v8 and options.build_v8_with_gn:
+    raise Exception(
+        '--build-v8-with-gn is incompatible with --without-bundled-v8.')
+  if options.build_v8_with_gn:
+    v8_path = os.path.join('deps', 'v8')
+    print('Fetching dependencies to build V8 with GN')
+    options.build_v8_with_gn = FetchDeps(v8_path)
+  o['variables']['build_v8_with_gn'] = b(options.build_v8_with_gn)
+
+
+def configure_openssl(o):
+  variables = o['variables']
+  variables['node_use_openssl'] = b(not options.without_ssl)
+  variables['node_shared_openssl'] = b(options.shared_openssl)
+  variables['openssl_no_asm'] = 1 if options.openssl_no_asm else 0
+  variables['openssl_fips'] = ''
+
+  if options.without_ssl:
+    def without_ssl_error(option):
+      error('--without-ssl is incompatible with %s' % option)
+    if options.shared_openssl:
+      without_ssl_error('--shared-openssl')
+    if options.openssl_no_asm:
+      without_ssl_error('--openssl-no-asm')
+    if options.openssl_fips:
+      without_ssl_error('--openssl-fips')
+    return
+
+  if options.use_openssl_ca_store:
+    o['defines'] += ['NODE_OPENSSL_CERT_STORE']
+  if options.openssl_system_ca_path:
+    variables['openssl_system_ca_path'] = options.openssl_system_ca_path
+  variables['node_without_node_options'] = b(options.without_node_options)
+  if options.without_node_options:
+      o['defines'] += ['NODE_WITHOUT_NODE_OPTIONS']
+
+  if not options.shared_openssl and not options.openssl_no_asm:
+    is_x86 = 'x64' in variables['target_arch'] or 'ia32' in variables['target_arch']
+
+    # supported asm compiler for AVX2. See https://github.com/openssl/openssl/
+    # blob/OpenSSL_1_1_0-stable/crypto/modes/asm/aesni-gcm-x86_64.pl#L52-L69
+    openssl110_asm_supported = \
+      ('gas_version' in variables and float(variables['gas_version']) >= 2.23) or \
+      ('xcode_version' in variables and float(variables['xcode_version']) >= 5.0) or \
+      ('llvm_version' in variables and float(variables['llvm_version']) >= 3.3) or \
+      ('nasm_version' in variables and float(variables['nasm_version']) >= 2.10)
+
+    if is_x86 and not openssl110_asm_supported:
+      error('''Did not find a new enough assembler, install one or build with
+       --openssl-no-asm.
+       Please refer to BUILDING.md''')
+
+  elif options.openssl_no_asm:
+    warn('''--openssl-no-asm will result in binaries that do not take advantage
+         of modern CPU cryptographic instructions and will therefore be slower.
+         Please refer to BUILDING.md''')
+
+  if options.openssl_no_asm and options.shared_openssl:
+    error('--openssl-no-asm is incompatible with --shared-openssl')
+
+  if options.openssl_fips:
+     error('FIPS is not supported in this version of Node.js')
+
+  configure_library('openssl', o)
+
+
+def configure_static(o):
+  if options.fully_static or options.partly_static:
+    if flavor == 'mac':
+      warn("Generation of static executable will not work on OSX "
+            "when using the default compilation environment")
+      return
+
+    if options.fully_static:
+      o['libraries'] += ['-static']
+    elif options.partly_static:
+      o['libraries'] += ['-static-libgcc', '-static-libstdc++']
+      if options.enable_asan:
+        o['libraries'] += ['-static-libasan']
+
+
+def write(filename, data):
+  filename = filename
+  print_verbose('creating %s' % filename)
+  with open(filename, 'w+') as f:
+    f.write(data)
+
+do_not_edit = '# Do not edit. Generated by the configure script.\n'
+
+def glob_to_var(dir_base, dir_sub, patch_dir):
+  list = []
+  dir_all = '%s/%s' % (dir_base, dir_sub)
+  files = os.walk(dir_all)
+  for ent in files:
+    (path, dirs, files) = ent
+    for file in files:
+      if file.endswith('.cpp') or file.endswith('.c') or file.endswith('.h'):
+        # srcfile uses "slash" as dir separator as its output is consumed by gyp
+        srcfile = '%s/%s' % (dir_sub, file)
+        if patch_dir:
+          patchfile = '%s/%s/%s' % (dir_base, patch_dir, file)
+          if os.path.isfile(patchfile):
+            srcfile = '%s/%s' % (patch_dir, file)
+            warn('Using floating patch "%s" from "%s"' % (patchfile, dir_base))
+        list.append(srcfile)
+    break
+  return list
+
+def configure_intl(o):
+  icus = [
+    {
+      'url': 'https://sourceforge.net/projects/icu/files/ICU4C/62.1/icu4c-62_1-src.zip',
+      'md5': '408854f7b9b58311b68fab4b4dfc80be',
+    },
+  ]
+  def icu_download(path):
+    # download ICU, if needed
+    if not os.access(options.download_path, os.W_OK):
+      error('''Cannot write to desired download path.
+        Either create it or verify permissions.''')
+    for icu in icus:
+      url = icu['url']
+      md5 = icu['md5']
+      local = url.split('/')[-1]
+      targetfile = os.path.join(options.download_path, local)
+      if not os.path.isfile(targetfile):
+        if nodedownload.candownload(auto_downloads, "icu"):
+          nodedownload.retrievefile(url, targetfile)
+      else:
+        print('Re-using existing %s' % targetfile)
+      if os.path.isfile(targetfile):
+        print('Checking file integrity with MD5:\r')
+        gotmd5 = nodedownload.md5sum(targetfile)
+        print('MD5:      %s  %s' % (gotmd5, targetfile))
+        if (md5 == gotmd5):
+          return targetfile
+        else:
+          error('Expected: %s      *MISMATCH*' % md5)
+          error('\n ** Corrupted ZIP? Delete %s to retry download.\n' % targetfile)
+    return None
+  icu_config = {
+    'variables': {}
+  }
+  icu_config_name = 'icu_config.gypi'
+  def write_config(data, name):
+    return
+
+  # write an empty file to start with
+  write(icu_config_name, do_not_edit +
+        pprint.pformat(icu_config, indent=2) + '\n')
+
+  # always set icu_small, node.gyp depends on it being defined.
+  o['variables']['icu_small'] = b(False)
+
+  with_intl = options.with_intl
+  with_icu_source = options.with_icu_source
+  have_icu_path = bool(options.with_icu_path)
+  if have_icu_path and with_intl != 'none':
+    error('Cannot specify both --with-icu-path and --with-intl')
+  elif have_icu_path:
+    # Chromium .gyp mode: --with-icu-path
+    o['variables']['v8_enable_i18n_support'] = 1
+    # use the .gyp given
+    o['variables']['icu_gyp_path'] = options.with_icu_path
+    return
+  # --with-intl=<with_intl>
+  # set the default
+  if with_intl in (None, 'none'):
+    o['variables']['v8_enable_i18n_support'] = 0
+    return  # no Intl
+  elif with_intl == 'small-icu':
+    # small ICU (English only)
+    o['variables']['v8_enable_i18n_support'] = 1
+    o['variables']['icu_small'] = b(True)
+    locs = set(options.with_icu_locales.split(','))
+    locs.add('root')  # must have root
+    o['variables']['icu_locales'] = string.join(locs,',')
+    # We will check a bit later if we can use the canned deps/icu-small
+  elif with_intl == 'full-icu':
+    # full ICU
+    o['variables']['v8_enable_i18n_support'] = 1
+  elif with_intl == 'system-icu':
+    # ICU from pkg-config.
+    o['variables']['v8_enable_i18n_support'] = 1
+    pkgicu = pkg_config('icu-i18n')
+    if pkgicu[0] is None:
+      error('''Could not load pkg-config data for "icu-i18n".
+       See above errors or the README.md.''')
+    (libs, cflags, libpath) = pkgicu
+    # libpath provides linker path which may contain spaces
+    if libpath:
+      o['libraries'] += [libpath]
+    # safe to split, cannot contain spaces
+    o['libraries'] += libs.split()
+    if cflags:
+      o['include_dirs'] += filter(None, map(str.strip, cflags.split('-I')))
+    # use the "system" .gyp
+    o['variables']['icu_gyp_path'] = 'tools/icu/icu-system.gyp'
+    return
+
+  # this is just the 'deps' dir. Used for unpacking.
+  icu_parent_path = 'deps'
+
+  # The full path to the ICU source directory. Should not include './'.
+  icu_full_path = 'deps/icu'
+
+  # icu-tmp is used to download and unpack the ICU tarball.
+  icu_tmp_path = os.path.join(icu_parent_path, 'icu-tmp')
+
+  # canned ICU. see tools/icu/README.md to update.
+  canned_icu_dir = 'deps/icu-small'
+
+  # We can use 'deps/icu-small' - pre-canned ICU *iff*
+  # - with_intl == small-icu (the default!)
+  # - with_icu_locales == 'root,en' (the default!)
+  # - deps/icu-small exists!
+  # - with_icu_source is unset (i.e. no other ICU was specified)
+  # (Note that this is the *DEFAULT CASE*.)
+  #
+  # This is *roughly* equivalent to
+  # $ configure --with-intl=small-icu --with-icu-source=deps/icu-small
+  # .. Except that we avoid copying icu-small over to deps/icu.
+  # In this default case, deps/icu is ignored, although make clean will
+  # still harmlessly remove deps/icu.
+
+  # are we using default locales?
+  using_default_locales = ( options.with_icu_locales == icu_default_locales )
+
+  # make sure the canned ICU really exists
+  canned_icu_available = os.path.isdir(canned_icu_dir)
+
+  if (o['variables']['icu_small'] == b(True)) and using_default_locales and (not with_icu_source) and canned_icu_available:
+    # OK- we can use the canned ICU.
+    icu_config['variables']['icu_small_canned'] = 1
+    icu_full_path = canned_icu_dir
+
+  # --with-icu-source processing
+  # now, check that they didn't pass --with-icu-source=deps/icu
+  elif with_icu_source and os.path.abspath(icu_full_path) == os.path.abspath(with_icu_source):
+    warn('Ignoring redundant --with-icu-source=%s' % with_icu_source)
+    with_icu_source = None
+  # if with_icu_source is still set, try to use it.
+  if with_icu_source:
+    if os.path.isdir(icu_full_path):
+      print('Deleting old ICU source: %s' % icu_full_path)
+      shutil.rmtree(icu_full_path)
+    # now, what path was given?
+    if os.path.isdir(with_icu_source):
+      # it's a path. Copy it.
+      print('%s -> %s' % (with_icu_source, icu_full_path))
+      shutil.copytree(with_icu_source, icu_full_path)
+    else:
+      # could be file or URL.
+      # Set up temporary area
+      if os.path.isdir(icu_tmp_path):
+        shutil.rmtree(icu_tmp_path)
+      os.mkdir(icu_tmp_path)
+      icu_tarball = None
+      if os.path.isfile(with_icu_source):
+        # it's a file. Try to unpack it.
+        icu_tarball = with_icu_source
+      else:
+        # Can we download it?
+        local = os.path.join(icu_tmp_path, with_icu_source.split('/')[-1])  # local part
+        icu_tarball = nodedownload.retrievefile(with_icu_source, local)
+      # continue with "icu_tarball"
+      nodedownload.unpack(icu_tarball, icu_tmp_path)
+      # Did it unpack correctly? Should contain 'icu'
+      tmp_icu = os.path.join(icu_tmp_path, 'icu')
+      if os.path.isdir(tmp_icu):
+        os.rename(tmp_icu, icu_full_path)
+        shutil.rmtree(icu_tmp_path)
+      else:
+        shutil.rmtree(icu_tmp_path)
+        error('--with-icu-source=%s did not result in an "icu" dir.' % \
+               with_icu_source)
+
+  # ICU mode. (icu-generic.gyp)
+  o['variables']['icu_gyp_path'] = 'tools/icu/icu-generic.gyp'
+  # ICU source dir relative to tools/icu (for .gyp file)
+  o['variables']['icu_path'] = icu_full_path
+  if not os.path.isdir(icu_full_path):
+    warn('* ECMA-402 (Intl) support didn\'t find ICU in %s..' % icu_full_path)
+    # can we download (or find) a zipfile?
+    localzip = icu_download(icu_full_path)
+    if localzip:
+      nodedownload.unpack(localzip, icu_parent_path)
+  if not os.path.isdir(icu_full_path):
+    error('''Cannot build Intl without ICU in %s.
+       Fix, or disable with "--with-intl=none"''' % icu_full_path)
+  else:
+    print_verbose('* Using ICU in %s' % icu_full_path)
+  # Now, what version of ICU is it? We just need the "major", such as 54.
+  # uvernum.h contains it as a #define.
+  uvernum_h = os.path.join(icu_full_path, 'source/common/unicode/uvernum.h')
+  if not os.path.isfile(uvernum_h):
+    error('Could not load %s - is ICU installed?' % uvernum_h)
+  icu_ver_major = None
+  matchVerExp = r'^\s*#define\s+U_ICU_VERSION_SHORT\s+"([^"]*)".*'
+  match_version = re.compile(matchVerExp)
+  for line in open(uvernum_h).readlines():
+    m = match_version.match(line)
+    if m:
+      icu_ver_major = m.group(1)
+  if not icu_ver_major:
+    error('Could not read U_ICU_VERSION_SHORT version from %s' % uvernum_h)
+  icu_endianness = sys.byteorder[0];
+  o['variables']['icu_ver_major'] = icu_ver_major
+  o['variables']['icu_endianness'] = icu_endianness
+  icu_data_file_l = 'icudt%s%s.dat' % (icu_ver_major, 'l')
+  icu_data_file = 'icudt%s%s.dat' % (icu_ver_major, icu_endianness)
+  # relative to configure
+  icu_data_path = os.path.join(icu_full_path,
+                               'source/data/in',
+                               icu_data_file_l)
+  # relative to dep..
+  icu_data_in = os.path.join('..','..', icu_full_path, 'source/data/in', icu_data_file_l)
+  if not os.path.isfile(icu_data_path) and icu_endianness != 'l':
+    # use host endianness
+    icu_data_path = os.path.join(icu_full_path,
+                                 'source/data/in',
+                                 icu_data_file)
+    # relative to dep..
+    icu_data_in = os.path.join('..', icu_full_path, 'source/data/in',
+                               icu_data_file)
+  # this is the input '.dat' file to use .. icudt*.dat
+  # may be little-endian if from a icu-project.org tarball
+  o['variables']['icu_data_in'] = icu_data_in
+  if not os.path.isfile(icu_data_path):
+    # .. and we're not about to build it from .gyp!
+    error('''ICU prebuilt data file %s does not exist.
+       See the README.md.''' % icu_data_path)
+  # map from variable name to subdirs
+  icu_src = {
+    'stubdata': 'stubdata',
+    'common': 'common',
+    'i18n': 'i18n',
+    'tools': 'tools/toolutil',
+    'genccode': 'tools/genccode',
+    'genrb': 'tools/genrb',
+    'icupkg': 'tools/icupkg',
+  }
+  # this creates a variable icu_src_XXX for each of the subdirs
+  # with a list of the src files to use
+  for i in icu_src:
+    var  = 'icu_src_%s' % i
+    path = '../../%s/source/%s' % (icu_full_path, icu_src[i])
+    icu_config['variables'][var] = glob_to_var('tools/icu', path, 'patches/%s/source/%s' % (icu_ver_major, icu_src[i]) )
+  # write updated icu_config.gypi with a bunch of paths
+  write(icu_config_name, do_not_edit +
+        pprint.pformat(icu_config, indent=2) + '\n')
+  return  # end of configure_intl
+
+def configure_inspector(o):
+  disable_inspector = (options.without_inspector or
+                       options.with_intl in (None, 'none') or
+                       options.without_ssl)
+  o['variables']['v8_enable_inspector'] = 0 if disable_inspector else 1
+
+
+def make_bin_override():
+  if sys.platform == 'win32':
+    raise Exception('make_bin_override should not be called on win32.')
+  # If the system python is not the python we are running (which should be
+  # python 2), then create a directory with a symlink called `python` to our
+  # sys.executable. This directory will be prefixed to the PATH, so that
+  # other tools that shell out to `python` will use the appropriate python
+
+  which_python = which('python')
+  if (which_python and
+      os.path.realpath(which_python) == os.path.realpath(sys.executable)):
+    return
+
+  bin_override = os.path.abspath('out/tools/bin')
+  try:
+    os.makedirs(bin_override)
+  except OSError as e:
+    if e.errno != errno.EEXIST: raise e
+
+  python_link = os.path.join(bin_override, 'python')
+  try:
+    os.unlink(python_link)
+  except OSError as e:
+    if e.errno != errno.ENOENT: raise e
+  os.symlink(sys.executable, python_link)
+
+  # We need to set the environment right now so that when gyp (in run_gyp)
+  # shells out, it finds the right python (specifically at
+  # https://github.com/nodejs/node/blob/d82e107/deps/v8/gypfiles/toolchain.gypi#L43)
+  os.environ['PATH'] = bin_override + ':' + os.environ['PATH']
+
+  return bin_override
+
+output = {
+  'variables': {},
+  'include_dirs': [],
+  'libraries': [],
+  'defines': [],
+  'cflags': [],
+}
+
+# Print a warning when the compiler is too old.
+check_compiler(output)
+
+# determine the "flavor" (operating system) we're building for,
+# leveraging gyp's GetFlavor function
+flavor_params = {}
+if (options.dest_os):
+  flavor_params['flavor'] = options.dest_os
+flavor = GetFlavor(flavor_params)
+
+configure_node(output)
+configure_library('zlib', output)
+configure_library('http_parser', output)
+configure_library('libuv', output)
+configure_library('libcares', output)
+configure_library('nghttp2', output)
+# stay backwards compatible with shared cares builds
+output['variables']['node_shared_cares'] = \
+    output['variables'].pop('node_shared_libcares')
+configure_v8(output)
+configure_openssl(output)
+configure_intl(output)
+configure_static(output)
+configure_inspector(output)
+
+# variables should be a root level element,
+# move everything else to target_defaults
+variables = output['variables']
+del output['variables']
+
+# make_global_settings for special FIPS linking
+# should not be used to compile modules in node-gyp
+config_fips = { 'make_global_settings' : [] }
+if 'make_fips_settings' in output:
+  config_fips['make_global_settings'] = output['make_fips_settings']
+  del output['make_fips_settings']
+  write('config_fips.gypi', do_not_edit +
+        pprint.pformat(config_fips, indent=2) + '\n')
+
+# make_global_settings should be a root level element too
+if 'make_global_settings' in output:
+  make_global_settings = output['make_global_settings']
+  del output['make_global_settings']
+else:
+  make_global_settings = False
+
+output = {
+  'variables': variables,
+  'target_defaults': output,
+}
+if make_global_settings:
+  output['make_global_settings'] = make_global_settings
+
+print_verbose(output)
+
+write('config.gypi', do_not_edit +
+      pprint.pformat(output, indent=2) + '\n')
+
+write('config.status', '#!/bin/sh\nset -x\nexec ./configure ' +
+      ' '.join([pipes.quote(arg) for arg in original_argv]) + '\n')
+os.chmod('config.status', 0o775)
+
+config = {
+  'BUILDTYPE': 'Debug' if options.debug else 'Release',
+  'PYTHON': sys.executable,
+  'NODE_TARGET_TYPE': variables['node_target_type'],
+}
+
+if options.prefix:
+  config['PREFIX'] = options.prefix
+
+config = '\n'.join(map('='.join, config.iteritems())) + '\n'
+
+# On Windows there's no reason to search for a different python binary.
+bin_override = None if sys.platform == 'win32' else make_bin_override()
+if bin_override:
+  config = 'export PATH:=' + bin_override + ':$(PATH)\n' + config
+
+write('config.mk', do_not_edit + config)
+
+gyp_args = ['--no-parallel']
+
+if options.use_ninja:
+  gyp_args += ['-f', 'ninja']
+elif flavor == 'win' and sys.platform != 'msys':
+  gyp_args += ['-f', 'msvs', '-G', 'msvs_version=auto']
+else:
+  gyp_args += ['-f', 'make-' + flavor]
+
+if options.compile_commands_json:
+  gyp_args += ['-f', 'compile_commands_json']
+
+# pass the leftover positional arguments to GYP
+gyp_args += args
+
+if warn.warned and not options.verbose:
+  warn('warnings were emitted in the configure phase')
+
+print_verbose("running: \n    " + " ".join(['python', 'tools/gyp_node.py'] + gyp_args))
+run_gyp(gyp_args)