can someone remind me why our arch USE flags are in an "opt-out" system rather 
than "opt-in" ?  instead of adding things like:
dmi
icc
mmx
svga
...

to every non-x86 profile, why dont we mask these things in base/use.mask and 
then un-mask them in default-linux/x86 ?  doesnt that make more sense ?
-mike