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I've been messing around with Fortran and came up with a neat little physics program. There are two cars on the road and the program finds if they will collide given the speed and acceleration and distance between the two. But I have quite a few subroutines and would like to not just put them into a module but have them in separate files. But it doesnt seem to work. I'm using the intel fortran compiler(ver 8.1) and it gives me an error ": undefined reference to `MAIN__' " So whats going on here? I tested this out in windows using FTN95 and Plato and it works.