I'm trying to cross-compile the latest default out of Mercurial based on the status of this. Currently it fails with the following invocation:

$ ../configure --host=i686-w64-mingw32 --build=x86_64-redhat-linux-gnu --target=i686-w64-mingw32 --prefix=/usr/i686-w64-mingw32/sys-root/mingw --exec-prefix=/usr/i686-w64-mingw32/sys-root/mingw --bindir=/usr/i686-w64-mingw32/sys-root/mingw/bin --sbindir=/usr/i686-w64-mingw32/sys-root/mingw/sbin --sysconfdir=/usr/i686-w64-mingw32/sys-root/mingw/etc --datadir=/usr/i686-w64-mingw32/sys-root/mingw/share --includedir=/usr/i686-w64-mingw32/sys-root/mingw/include --libdir=/usr/i686-w64-mingw32/sys-root/mingw/lib --libexecdir=/usr/i686-w64-mingw32/sys-root/mingw/libexec --localstatedir=/usr/i686-w64-mingw32/sys-root/mingw/var --sharedstatedir=/usr/i686-w64-mingw32/sys-root/mingw/com --mandir=/usr/i686-w64-mingw32/sys-root/mingw/share/man --infodir=/usr/i686-w64-mingw32/sys-root/mingw/share/info --enable-ipv6 --enable-shared --with-computed-gotos=yes --with-dbmliborder=gdbm:ndbm:bdb --with-system-expat --with-system-ffi --with-pydebug --with-tsc
checking for hg... found
checking build system type... x86_64-redhat-linux-gnu
checking host system type... i686-w64-mingw32
checking for python interpreter for cross build... python3
checking for --enable-universalsdk... no
checking for --with-universal-archs... 32-bit
checking MACHDEP... configure: error: cross build not supported for i686-w64-mingw32
error: Bad exit status from /var/tmp/rpm-tmp.sZjjCl (%build)

This is in a Fedora 18 environment using its included MinGW packages to do the cross compile. I have applied no patches and just did the hg clone this morning from the official repository. Are any of these attached patches still necessary? Is there any documentation about what the process is now for doing the cross-compile build?