On Sun, 5 Apr 2020 at 20:15, ALAN P VONDEROHE via Gcc-help <gcc-help@xxxxxxxxxxx> wrote: > > Hello, > > All of a sudden, none of my FORTRAN programs can open files. Programs that opened files last week, cannot open them now. Any suggestions? I suggest reading http://www.catb.org/esr/faqs/smart-questions.html and I suggest you provide MUCH more information. Nobody can usefully answer this. Do you mean your code no longer works when it is recompiled? Or binaries that were already compiled just stopped working? Or something else? Are you even using GCC to compile your code? Which version? Did you change the version in the last week?