I'm trying to get mono 2.6.7 building on my OS X machine, and configure fails with the following relevant snippet: 

configure:3790: i686-apple-darwin10-gcc  -O2 -pipe -march=prescott -fno-strict-aliasing -arch i386 -D_XOPEN_SOURCE -mmacosx
-version-min=10.5  -no-cpp-precomp -D_THREAD_SAFE -DGC_MACOSX_THREADS -DPLATFORM_MACOSX -DUSE_MMAP -DUSE_MUNMAP -DGetCurren
tProcess=MonoGetCurrentProcess -DGetCurrentThread=MonoGetCurrentThread -DCreateEvent=MonoCreateEvent -arch i386 -D_XOPEN_SO
URCE -mmacosx-version-min=10.5 -Wl,-dead_strip_dylibs -pthread conftest.c  >&5
cc1: error: unrecognized command line option "-arch"
cc1: error: unrecognized command line option "-arch"

It looks like they're setting some flags in the 'configure' script if the host is darwin: 

                        case "$host" in
         i*86-*-darwin10*)
            BROKEN_DARWIN_FLAGS="-arch i386 -D_XOPEN_SOURCE -mmacosx-version-min=10.5"
            CPPFLAGS="$CPPFLAGS $BROKEN_DARWIN_FLAGS"
            CFLAGS="$CFLAGS $BROKEN_DARWIN_FLAGS"
            CXXFLAGS="$CXXFLAGS $BROKEN_DARWIN_FLAGS"
            CCASFLAGS="$CCASFLAGS $BROKEN_DARWIN_FLAGS"
            CPPFLAGS_FOR_LIBGC="$CPPFLAGS_FOR_LIBGC $BROKEN_DARWIN_FLAGS"
            CFLAGS_FOR_LIBGC="$CFLAGS_FOR_LIBGC $BROKEN_DARWIN_FLAGS"
            CPPFLAGS_FOR_EGLIB="$CPPFLAGS_FOR_EGLIB $BROKEN_DARWIN_FLAGS"
            CFLAGS_FOR_EGLIB="$CFLAGS_FOR_EGLIB $BROKEN_DARWIN_FLAGS"
            ;;
      esac

If I remove '-arch i386' , the ebuild compiles properly.  It appears to be an arg unique to Apple's version of gcc (?).  

So what's teh best way to fix and submit this?  I can make a patch file that the ebuild applies and post a diff.  Is there a better way to get the change into the tree?  Thanks!  

Logan Bowers