Hey, the current GNUmakefile in the root directory of SystemPreferences gives an error when compiling because it can't find the PreferencePanes/PreferencePanes.h header file included by main.m in SystemPreferences directory. The reason for this is because the header file and library for PreferencePanes still hadn't been installed. I tried playing with the makefiles but wasn't able to make it work properly (go rid of the header file not being found, but then the library wasn't found so there was a problem during linking).