`buildDrv' attribute gets added to every derivation in `makeStdenvCross'. So filter out those attributes. But the real question is why makeStdenvCross is applied when I'm not doing a cross compilation. svn path=/nixpkgs/trunk/; revision=19862
svn path=/nixpkgs/trunk/; revision=18469
to `overrideDerivation'. svn path=/nixpkgs/trunk/; revision=18466