Today I got the following error when executing regular
numpy code in my homebrew Python3.9 installation.
ImportError: dlopen(/usr/local/lib/python3.9/site-packages/scipy/linalg/_fblas.cpython-39-darwin.so, 0x0002): Library not loaded: /usr/local/opt/gcc/lib/gcc/10/libgfortran.5.dylib
Referenced from: /usr/local/lib/python3.9/site-packages/scipy/linalg/_fblas.cpython-39-darwin.so
Reason: tried: '/usr/local/opt/gcc/lib/gcc/10/libgfortran.5.dylib' (no such file), '/usr/local/lib/libgfortran.5.dylib' (no such file), '/usr/lib/libgfortran.5.dylib' (no such file)
The issue was that I had gcc 11 installed (you can check via
brew info gcc), but homebrew-installed bumpy expected gcc 10 to be installed.
Reinstalling numpy from bottle or from source didn’t work.
brew install gcc@10 sudo ln -s /usr/local/opt/gcc@10/lib/gcc/10/libgfortran.dylib /usr/local/lib/libgfortran.5.dylib sudo ln -s /usr/local/opt/gcc@10/lib/gcc/10/libquadmath.0.dylib /usr/local/lib/libquadmath.0.dylib