Hi, first of all thank you for your help. Typing "gfortran --version" in the Terminal I get the following "GNU Fortran (Homebrew GCC 9.2.0_1) 9.2.0 Copyright (C) 2019 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE." I suppose this means it is installed, right?