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 CC, CXX, and 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=flangGPL version 2 or version 3
None.