> We ended up modifying some of the libraries and got the "C" code to work > under Visual Studio 6. We had special libraries for the GNU C and for the > "C" component of the graphics libraries. All I want is the old fortran to > work under Visual Studio and call the old graphics library. The Fortran > is pure F77. I got a FTN95 compiler but its a totally new system with a > long learning curve. 1) -- F2C -- The F2C (from http://www.netlib.org/f2c, both libf2c.a and the executable) passes compilation on GCC 4.1.2 (that I have) without even one warning, simply by typing "GNUmake -f makefile.u". You can add -fPIC option and produce shared library. 2) -- Your special libs -- If you can compile and use your "special" C code on GCC, then you can work on any platform GCC is installed on. Otherwise you will be bound to Visual Studio, of which I have little knowledge. MinGW project should ensure interoperability with libraries compiled on Visual Studio. DJGPP (http://www.delorie.com/djgpp/) should too... Last time I compiled anything on Windows was in 2004, I had to :) Regards, Dima.