Possible macOS pip install fix

[ckoerber]

Hello,

I just briefly want to say thank you for providing gsum--which helps quite a lot simplifying the chiral analysis.

As you point out in the Readme, installing gsum via pip on macOS systems runs into possible issues. I have found that slightly updating the install command fixes this on my end and thought it might be helpful to post it here. I.e., I run

export CC=gcc-11; export CXX=g++-11; pip install git+https://github.com/buqeye/gsum --no-binary :all:

(I am not sure if I need to set both CC and CXX) with a homebrew install gcc (on Big Sur 11.5)

gcc-11 --version
gcc-11 (Homebrew GCC 11.1.0_1) 11.1.0

I would assume it also works with other compilers fulfilling the requirements.

Let me know if this is the right place to contact you or if you need further information.

Best regards,

Christopher