Fix 32-bit RPM build w/ newer RHEL/Fedora releases The version of RPM on RHEL 5 and older platforms defines _libdir as %{_exec_prefix}/%{_lib}, so defining _lib in the spec file redefined _libdir. However, newer versions of RPM (probably >= 4.6, since that was the version that introduced the ISA macros) define _libdir as either %{_prefix}/lib or %{_prefix}/lib64. Thus, we need to explicitly override _libdir in our spec file.