Is there a clear procedure to be able to build i386 versions of rpms on a Fedora Core 4 x86_64 installation? There are a few packages like gromacs with i386 assembly optimizations which don't exist when built as x86_64. I tried using... linux32 rpmbuild -ba gromacs.spec ...but it seems that the required i386 parts of the gcc compiler are not installed. In particular, I am concerned about how destabilized my build system will become if I attempt to configure the machine to build both architectures. Thanks in advance for any information. Jack