two more things that need to be done for gcc4:

	- mips vs. packed attribute.  see the discusion here.

	- m68k Xserver fails to build with:

xfree/xc/programs/Xserver/mfb/mfbfillsp.c:813: warning: matching constraint does not allow a register

	  for many lines..  i looked quickly but it's macros using macros
	  and i didn't find the end of the chain yet.