diff --git a/IlmBase/CMakeLists.txt b/IlmBase/CMakeLists.txt
index e04255f8..b349d562 100644
--- a/IlmBase/CMakeLists.txt
+++ b/IlmBase/CMakeLists.txt
@@ -3,6 +3,9 @@ CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
 
 PROJECT ( ILMBase )
 
+# Allow the developer to select if Dynamic or Static libraries are built
+OPTION (BUILD_SHARED_LIBS "Build Shared Libraries" ON)
+
 IF ( NOT WIN32)
   ADD_DEFINITIONS ( -pthread )
 ENDIF ()
@@ -59,6 +62,14 @@ MACRO(GET_TARGET_PROPERTY_WITH_DEFAULT _variable _target _property _default_valu
    INSTALL( FILES ${_laname} DESTINATION ${CMAKE_INSTALL_PREFIX}${_install_DIR})
  ENDMACRO(CREATE_LIBTOOL_FILE)
 
+SET (LIB_TYPE STATIC)
+IF (BUILD_SHARED_LIBS)
+  # User wants to build Dynamic Libraries, so change the LIB_TYPE variable to CMake keyword 'SHARED'
+  SET (LIB_TYPE SHARED)
+  ADD_DEFINITIONS(-DOPENEXR_DLL)
+ENDIF (BUILD_SHARED_LIBS)
+
+
 ADD_SUBDIRECTORY ( Half )
 ADD_SUBDIRECTORY ( Iex )
 ADD_SUBDIRECTORY ( IexMath )
diff --git a/IlmBase/Half/CMakeLists.txt b/IlmBase/Half/CMakeLists.txt
index 3b97d7e1..50ebe966 100644
--- a/IlmBase/Half/CMakeLists.txt
+++ b/IlmBase/Half/CMakeLists.txt
@@ -32,7 +32,11 @@ SET_SOURCE_FILES_PROPERTIES(
   ${CMAKE_CURRENT_SOURCE_DIR}/toFloat.h
   )
 
-ADD_LIBRARY ( Half STATIC
+IF(BUILD_SHARED_LIBS)
+    ADD_DEFINITIONS(-DHALF_EXPORTS)
+ENDIF()
+
+ADD_LIBRARY ( Half ${LIB_TYPE}
   half.cpp
   )
 
diff --git a/IlmBase/Half/halfExport.h b/IlmBase/Half/halfExport.h
index c6bb7152..3a0c86a2 100644
--- a/IlmBase/Half/halfExport.h
+++ b/IlmBase/Half/halfExport.h
@@ -11,28 +11,16 @@
 //  This copyright notice does not imply publication.
 //
 
-#if defined(PLATFORM_WINDOWS)
-#  if defined(PLATFORM_BUILD_STATIC)
-#    define PLATFORM_EXPORT_DEFINITION 
-#    define PLATFORM_IMPORT_DEFINITION
-#  else
-#    define PLATFORM_EXPORT_DEFINITION __declspec(dllexport) 
-#    define PLATFORM_IMPORT_DEFINITION __declspec(dllimport)
-#  endif
-#else   // linux/macos
-#  if defined(PLATFORM_VISIBILITY_AVAILABLE)
-#    define PLATFORM_EXPORT_DEFINITION __attribute__((visibility("default")))
-#    define PLATFORM_IMPORT_DEFINITION
-#  else
-#    define PLATFORM_EXPORT_DEFINITION 
-#    define PLATFORM_IMPORT_DEFINITION
-#  endif
-#endif
-
-#if defined(HALF_EXPORTS)                          // create library
-#  define HALF_EXPORT PLATFORM_EXPORT_DEFINITION
-#else                                              // use library
-#  define HALF_EXPORT PLATFORM_IMPORT_DEFINITION
+#if defined(OPENEXR_DLL)
+    #if defined(HALF_EXPORTS)
+    #define HALF_EXPORT __declspec(dllexport)
+    #else
+    #define HALF_EXPORT __declspec(dllimport)
+    #endif
+    #define HALF_EXPORT_CONST
+#else
+    #define HALF_EXPORT
+    #define HALF_EXPORT_CONST const
 #endif
 
 #endif // #ifndef HALFEXPORT_H
diff --git a/IlmBase/Imath/CMakeLists.txt b/IlmBase/Imath/CMakeLists.txt
index a4f471f6..afea1fad 100644
--- a/IlmBase/Imath/CMakeLists.txt
+++ b/IlmBase/Imath/CMakeLists.txt
@@ -1,6 +1,10 @@
 # yue.nicholas@gmail.com
 
-ADD_LIBRARY ( Imath STATIC
+IF(BUILD_SHARED_LIBS)
+    ADD_DEFINITIONS(-DIMATH_EXPORTS)
+ENDIF()
+
+ADD_LIBRARY ( Imath ${LIB_TYPE}
   ImathBox.cpp
   ImathRandom.cpp
   ImathColorAlgo.cpp
@@ -9,6 +13,8 @@ ADD_LIBRARY ( Imath STATIC
   ImathVec.cpp
   ImathMatrixAlgo.cpp
 )
+TARGET_LINK_LIBRARIES(Imath Iex)
+
 
 INSTALL ( TARGETS
   Imath