2.10 Environment variables affecting gfortran

The gfortran compiler currently does not make use of any environment variables to control its operation above and beyond those that affect the operation of gcc.

See Environment Variables Affecting GCC, for information on environment variables.

See Runtime, for environment variables that affect the run-time behavior of programs compiled with GNU Fortran.

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https://gcc.gnu.org/onlinedocs/gcc-4.9.3/gfortran/Environment-Variables.html