Hi,
the usual method, i.e.
setarch i386 rpmbuild --rebuild --target i386 mesa-7.1-0.35.fc9.src.rpm
or
rpm -ivh mesa-7.1-0.35.fc9.src.rpm
setarch i386 rpmbuild -ba --target i386 mesa.spec
doesn't work. It still thinks it compiles for 64-bit.
Best regards,
Zoltán Böszörményi