On 27 August 2012 19:03, Jason Clark wrote: > Thank you for your help in advance, I am absolutely new to gfortran > and am now stuck. I am using Windows Vista and attempting to compile > some code that has #include "..." statements that reference a file not > in the same location as the .f file. The command I input is as > follows: > > gfortran -iquote > c:\programfiles\aspentech\aspenplus2006.5\engine\commons > -xf77-cpp-input usrkpg2.f > > The error I receive is as follows: > > usrkpg2.f:66:0: fatal error: rcst_rcstri.cmon: No such file or > directory compilation terminated I don't know how gfortran uses the preprocessor, but you would usually use -I to find headers, not -iquote, which is for more specialized uses. Does using -I work?