Hi - I am trying to compile a fortran (f90) code and trying to debug with an array and subroutine check to see if variables are not lining up ccrrectly. If I use “gfortran -fcheck=all fort1.exe fort1.f90, where fort1.f90 contains all of the code, it returns the following message and does not compile. Instead, the program returns ‘f951: error: unrecognized command line option "-fcheck=all” . Is there something I am doing incorrectly? SIncerely, RIchard Gustafson