wrap calls to pip to force usage of the GCC environment over Clang

pipx.sh

# I've added this to my ~/.bash_profile to use it, you could also create a stand-alone shell script.

# Usage: pipx install cython

function pipx() {
    # Many Python packages don't install correctly with clang, as mentioned here:
    #   https://gist.github.com/goldsmith/7262122
    # This wrapper forces gcc for pip installations:
    export CFLAGS="-arch i386 -arch x86_64"
    export FFLAGS="-m32 -m64"
    export LDFLAGS="-Wall -undefined dynamic_lookup -bundle -arch i386 -arch x86_64"
    export CC=gcc
    export CXX="g++ -arch i386 -arch x86_64"
    sudo -E pip "$@"
}