Am having some trouble compiling a simple fortran program on my M1 MacBook Air. I am using the latest MacOS, Monterey 12.3.1, and the latest version of Xcode. I installed Homebrew and gcc to update my old version of gfortran. The fortran program on my desktop will compile when I use the command gfortran -c skippy.f, producing the executable file skippy.o on my desktop. But I can’t get the executable file to run. I am an amateur and am really not that familiar with the unix commands, etc. Can someone give me some advice on this? Thanks. -Dave ~/Desktop 519 $ gfortran -o skippy.f gfortran: fatal error: no input files; unwilling to write output files compilation terminated. ~/Desktop 520 $ gfortran -c skippy.f ~/Desktop 521 $ ./skippy.o -bash: ./skippy.o: Permission denied ~/Desktop 522 $ gfortran skippy.f ld: library not found for -lSystem collect2: error: ld returned 1 exit status ~/Desktop 523 $ g77 skippy.f -bash: g77: command not found ~/Desktop 524 $
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