On Wed, 9 Apr 2008, Bailey, Eric wrote:
/home/MPI/openmpi-1.2.6/configure --prefix=/home/MPI/openmpi-1.2.6/openmpi-1.2.6-install-7448 --host=ppc74xx-linux --build=i686-pc-linux-gnu
--host should be formated in the output of config.guess, which would be something along the lines of processor family-vendor-os. Note that processor family gets lumped together in pretty large chunks. I'm guessing that if you could run config.guess on your machine (it requires a working compiler in some instances), you'd find it would return something like: powerpc-unknown-linux-gnu. If you pass that as --host, I'm pretty sure you'll get what you need. If your cross-compilers are named ppc74xx-linux-gcc, you'll have to then set CC, CXX, FC, and F77 explicitly.
Brian