f2py, by default, seems to prefer g77 (no longer maintained, deprecated, speedy, doesn't support Fortran 90 or Fortran 95) over gfortran (maintained, slower, Fortran 90 and Fortran 95 support).
This causes problems when we try to compile Fortran 90 extensions using f2py on platforms where both g77 and gfortran are installed without manually switching the compiler's flags. It is a very minor edit to the fcompiler/__init__.py file to prefer gfortran over g77 on OS X, and I can think of almost no reason not to do so, since the Vectorize framework (OS X tuned LAPACK/BLAS) appears to be ABI compatible with gfortran. I am not sure what the situation is on the distributions that numpy is trying to support, but my feeling is that g77 should not be preferred when gfortran is available. Regards, Aron
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