Hmmm, I guess that we are not properly detecting the compiler in that case for some reason. I will take a look at it. I think it should still work to configure with CXXDEFS=-D__MNO_CYGWIN Ted -- Dr. Ted Ralphs Associate Professor Industrial and Systems Engineering Lehigh University (610)758-4784 tkralphs at lehigh.edu www.lehigh.edu/~tkr2