This package represents the required Fortran compiler.
Officially we support gfortran from GNU Compiler Collection (GCC). It has also been reported that using flang
(from LLVM) might work.
You can pass the names of compilers to use to ./configure using
the environment variables :envvar:`CC`, :envvar:`CXX`, and
:envvar:`FC`, for C, C++, and Fortran compilers, respectively.
For example, if your C compiler is clang, your C++ compiler is
clang++, and your Fortran compiler is flang, then you would
need to run:
$ ./configure CC=clang CXX=clang++ FC=flang
GPL version 2 or version 3
None.