https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80859
--- Comment #20 from Thorsten Kurth <thorstenkurth at me dot com> --- To compile the code, edit the GNUmakefile to suit your needs (feel free to ask any questions) and in order to run it run the generated executable, called something like main3d.XXX.XXXX.. and the XXX tell you if you compiled with MPI, OpenMP, etc. There is an inputs file you just pass to it: ./main3d...... inputs That's it. Tell me if you need more info.