>> Should this code rather be in a different .pm and the user selects
>> which one to use via the .ini file?
> Yes, that's also what I thought. Then we need to change a little in
> upper level, e.g. OMPI.pm, we should test the environment and
> compiler, in order to choose the right install module (Gnu_install.pm
> or Win_install.pm maybe).
Sorry, I might be wrong on this point, actually I tried, but I didn't
figure out how to do that.