Hi, I'd encourage people to compile and test the IO, Directory, and CPUTime support I've just committed. The added primitives call upon misc OS functionality, which might not be present on a particular platform (or live in a different header file etc.) I believe I've augmented the configure script so this won't be an issue, but you never know about these things.... btw, if you don't want Directory and/or CPUTime support, prelude.h contains #defines that control this. The IO impl is mostly Haskell98 compliant; the main bit it doesn't implement is the H98 file locking rules. --sigbjorn