Building with python universal2 fails with duplicate symbol

[thierryba]

Hello there,
I wanted to install m2crypto on my macOS 12.1.
There is python 3.8.9 installed by default.
So I built openssl (twice to get a universal binary) as static libs.
I installed swig from brew.

Then I do this:
/usr/bin/pip3 install --global-option=build_ext --global-option="--openssl=/usr/local/.fw3rdparty/toto-MacOS" m2crypto

This fails to link with:
clang -bundle -undefined dynamic_lookup -arch arm64 -arch x86_64 -Wl,-headerpad,0x1000 build/temp.macosx-10.14-x86_64-3.8/src/SWIG/_m2crypto_wrap.o -L/usr/local/.fw3rdparty/toto-MacOS/lib -lssl -lcrypto -o build/lib.macosx-10.14-x86_64-3.8/M2Crypto/_m2crypto.cpython-38-darwin.so
duplicate symbol '_tlsv1_method' in:
build/temp.macosx-10.14-x86_64-3.8/src/SWIG/_m2crypto_wrap.o
/usr/local/.fw3rdparty/toto-MacOS/lib/libssl.a(methods.o)
ld: 1 duplicate symbol for architecture arm64

Any help would be appreciated.