On MacOS can't build IDE.
Fresh install on MacOS High Sierra 10.13.2 -> Tools -> "Build Normal IDE" ends with "Error lazarus.pp(57,13) Fatal: Cannot find Interfaces used by Lazarus, incompatible ppu=/ ..... / interfaces.ppu, package LCL". Changing options to clean all or any other (carbon,cocoa, 32,64bit...) don't help.