From Get docs
This is a CMake Environment Variable. Its initial value is taken from the calling process environment.
Preferred executable for compiling
Fortran language files. Will only be used by CMake on the first configuration to determine
Fortran compiler, after which the value for
Fortran is stored in the cache as CMAKE_Fortran_COMPILER. For any configuration run (including the first), the environment variable will be ignored if the CMAKE_Fortran_COMPILER variable is defined.
Options that are required to make the compiler work correctly can be included; they can not be changed.
$ export FC="custom-compiler --arg1 --arg2"
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