dominique> > Colin, your line is too long for the fixed form implied by dominique> the .f suffix: colin> Argh! Yes, of course. It must be that g77 didn't have that colin> limit since the colin> program used to build ok with that. Now I am curious why that would be, I was under the impression that (in absence of any flags) the 72 char was the default in g77? Did you have a Makefile or other build system that had some additional flags when using g77? (I am in the positon of helping Fortran users get their programs working without actually being a Fortran user so little bits of info like this are useful!) man g77 says: -ffixed-line-length-n Set column after which characters are ignored in typical fixed-form lines in the source file, and through which spaces are assumed (as if padded to that length) after the ends of short fixed-form lines. Popular values for n include 72 (the standard and the default), 80 (card image), and 132 ... ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^