Use "x86_64 i386" for fallback universal_archs on 10.6 and later, stay with "i386 ppc" for 10.5 and earlier.
Use "x86_64 i386" for fallback universal_archs on 10.6 and later, stay with "i386 ppc" for 10.5 and earlier.

git-svn-id: 620571fa9b4bd0cbce9a0cf901e91ef896adbf27@52397 d073be05-634f-4543-b044-5fe20cf6d1d6

danchr/macports-base,neverpanic/macports-base,danchr/macports-base,macports/macports-base,neverpanic/macports-base,macports/macports-base