I tryed to emerge flightgear on a new (PPC) system, it failed during config and complained about missing glut.h
Created attachment 54481 [details] log of the failed emerge Here is the log of the emergeattemt
Mr_Bones_: I haven't tested this with -glut+sdl (the packages not the use flags), but I'll give it a go and check.
virtual/glut added to depend/rdepend strings. Thanks!