NLEQ1 and open source Fortran

Hello I've been having some troubles trying to solve al large scale
nonlinear system using nleq1. When I compile it using Intel's Fortran
Compiler everything works properly, but since I'm trying not to use
comercial software I tried compiling my program using GNU's (gcc)
GFortran. When doing this I get the solver stops due to singular matrix
problems. I've checked that the SMALL and EPMACH values are the right
ones for my machine, and I'm using the files downloaded right from
http://www.zib.de/Numerik/numsoft/CodeLib/codes/nleq1/. And besides
that, the solver works fine with Intel's fortran...

Does any body know how to correct this, or why it works on comercial
fortran compilers and not with open source compilers??

thanks,
Rodrigo

.

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