Ulrich, Thanks for the explanation. I assume the default for rpm is not set to show both architectures since that would confuse too many installation utilities? Also, I am still unclear on what I should expect 'rpm -Uvh' to do. Is it safe to assume that it will never replace the x86_64 binary rpms if I install an i386 binary rpm which has the same name? Also, do all the *-devel packages coexist for both architectures at the same time or should I only have one of them installed at a given time? Jack