Cross Tool Chain for Pistachio on PPC

Hi,
I was following ppc-build.txt in the documentation notes to build a
cross-gcc on a Cygwin host for the PPC-ELF target. I used the the
gcc-3.4.4 sources from Cygwin (core, g++, objc and testsuit). Binutils
worked fine and is included in PATH. But now I get the following error:

<error>
configure: error: No support for this host/target combination.
make: *** [configure-target-libstdc++-v3] Error 1
</error>

That's what I did:
1.) ../gcc-3.4.4/configure --target=powerpc-elf\
       --enable-languages="c,c++,objc" -- with-gnu-as\
       --with-gnu-ld --prefix=$CROSSTOOL
2.) Changed the makefile accordingly.
3.) make

I know this has something to do with the C++ standard library, which
would actually need knowledge about the OS the properly create the
syscalls. But since I want to build an OS (Pistaccio), I don't need
these anyways. Other tutorials, such as Robert Schiele: "Building and
Using a Cross Development Tool Chain" or IBM's Developer Works tutorial
use a 3-stage compilation.

Ok, I'm confused. But considering gcc is not a small tool, I think it's
ok to be confused.

In hope for some clarity,

Martin.