Hi, After having failed to correctly install glpk, I am trying another approach. I came across http://www2.isye.gatech.edu/~wcook/qsopt/ which appears to be able to solve linear programs. I tried installing the callable library but when I try to compile, I get a bunch of errors of the type "undefined reference to __getreent" Ordinary c programs compile just fine. Any ideas? Joe McCollum Forest Inventory and Analysis Knoxville, TN 37919 ________________________________________________________________________ Save hundreds of dollars a year with Juno Internet access. Plans start as low as $9.95 a month. Visit Juno today! http://track.juno.com/s/lc?u=http://ads.addynamix.com/click/2-2130421-170