Mac OS X 10.4 (Tiger) contains some really neat stuff, like wxWidgets, wxPython, and wxPerl preinstalled — but man, I’m experiencing some free software lossage since I upgraded.
I had just been making good friends with the wealth of cool software in the unstable distribution of the Fink project, and, well, you can’t necessarily count on any of that compiling on 10.4. Specifically, my beloved GIMP 2.0 doesn’t compile. And I couldn’t get the XSane plugin working together with GIMP 1.2, which does compile.
Huge disappointment: JACK for OS X doesn’t work on Tiger yet. There goes a lot of great open source audio fun.