To me one of the general short comings of FOSS licenses is the question of the compiler. To me something is only truely FOSS if along with the binary I get I also have access to a compiler that is available under a FOSS license and the compiler flags. Anything else may be readable in source, but simply not really enabling me to reproduce the binary in the original or in a slightly altered way.

Easily the best bug ever. Its been paramount in enabling continous "innovation" as people speed jump through maps.