The good news: Almost all of scipy now compiles on AIX 4.x (at least on the SP3) using cc_r and g77. The lone non-ported piece is the vq stuff in cluster. It needs a C++ compiler, and I haven't figured out how to force distutils to use gcc instead of cc_r (or use cc_r for C files and gcc for C++) files. It was good to try this because cc_r found a few portability issues in the C code. (cc_r is the thread-safe standard C compiler on AIX). The bad news: Many of the isinf, isnan, isfinite tests fail on this platform. We new this was gonna be a headache, and it is. No time to explore fixing this now, but will look into the issues as soon as possible. eric