Mac CI: is gfortran there? (#6)
* Mac CI: is gfortran there? * Mac CI: is gfortran there? * Try to find gfortran via gcc * Try to find gfortran via gcc * Blindly try gfortran-9 as a Fortran compiler * More shots in the dark for gfortran on Github * Use F77/F90 env vars to point setuptools on Mac Github CI towards a Fortran comiler