Sorry to flood your mailboxes with my junk, but I had a few questions on the configuration and Makefiles for building GHC on OS 10.4: The odd memory bugs (wierd malloc errors) seem to remind me of errors using pthreads... in Joel Reymont's email, I noticed that ghc is given the -threaded option: ../../ghc/compiler/stage1/ghc-inplace -o stage2/ghc-6.4.3 ... ... -threaded -package readline -DUSE_READLINE - I have not had any luck using -threaded with GHC on my own programs, but I do not know what options GHC passes to gcc with -threaded. If GHC -threaded means it passes gcc the -pthread option when compiling -fvia-C, the problem might be that Apple's gcc does not recognize the -pthread flag (you have to link -lpthread manually, preferably after the object files). If I can get the configuration correct--or whatever parameters you think you might want--I will get a clean distribution and try to build ghc-6.4.3 tomorrow (I am using a 1.25 MHz PPC). -Peter Tanski