Haskell on Mac OS X has been mostly painless for me. I have a PowerPC mac which means there are rarely binaries for me to download from haskell.org. I've either used MacPorts or compiled the GHC from source, both have worked well. I prefer the latter, but you'll probably want MacPorts anyway for gcc and non-haskell libs. I did some HOpenGL stuff about a year ago and cannot recall having any problems. Occasionally you'll have to do something like "install PCRE using MacPorts and add /opt/local/lib to $LD_LIBRARY_PATH"[1] but mostly things just work. I believe the readline/libedit thing caused minor headache at some point (but far less than on the Red Hat linux box on which I have no root/sudo access). Everything certainly works infinitely better than on Cygwin. :P Sorry about not being able to give more details, any issues I may have had are not fresh in memory. But in short I don't think you'll have any more/significantly different problems than on Linux, and probably substantially less than on Windows (or I'm doing something wrong). Barring where the above contradicts him I concur with Thomas Davie. ;) Thanks, Bjorn Buckwalter [1] http://tinyurl.com/cw64nd