I'm trying to install fastecdsa on macOS BigSur (M1 chip) by running

(venv) $ pip3 install fastecdsa

and even though I previously installed gmp:

$ brew install gmp

it cant find the lib, no matter what I do

    src/curve.h:4:10: fatal error: 'gmp.h' file not found
    #include "gmp.h"

Although the error changed when I created a symlink

ln -s /opt/homebrew/include/gmp.h /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include

and now I get:

    ld: library not found for -lgmp
    clang: error: linker command failed with exit code 1 (use -v to see invocation)
    error: command '/usr/bin/gcc' failed with exit code 1

I also tried:

• passing the path via env CFLAGS, LDFLAGS and both via global env export (export CFLAGS=...)

LDFLAGS=-L/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/lib pip3 install fastecdsa

CFLAGS=-I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include pip3 install fastecdsa

• xcode-select --install
• endlessly brew uninstall gmp and brew install gmp, even brew reinstall gmp and brew unlink gmp
• installing rosetta2
• turning it off and on again

I can't put my finger on it :(