Some gfortran options allow you to include paths to fortran libraries and modules:
$ gfortran -c <código fonte> [opções]
The functions include -J<path file .mod> , which allows you to indicate the directories of the modules, as well as -I and -L .
The question is whether in gfortran it is possible to make use of environment variables and thus define a path to execute the programs. Would it also be another way of referring to file.[90 or 95 or 03 or 08] ?