I cannot get Frag to compile. Running "ghc --make -O2 -fglasgow-exts main.hs" gives ... Compiling Quaternion ( ./Quaternion.hs, ./Quaternion.o ) Compiling ReadImage ( ./ReadImage.hs, ./ReadImage.o ) ./ReadImage.hs:60: Type constructor or class not in scope: `PixelData' ./ReadImage.hs:68: Data constructor not in scope: `PixelData' I am using ghc 6.2.2. I have tried adding "-package GLUT" to the command line, but still the same output. Daniel __________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com