Attached is a patch for bug 460510, which is a bug in the RPM spec file.
https://bugzilla.redhat.com/show_bug.cgi?id=460510
Dave
diff --git a/libvirt.spec.in b/libvirt.spec.in
index cddf5c8..8638377 100644
--- a/libvirt.spec.in
+++ b/libvirt.spec.in
@@ -21,7 +21,7 @@
%define with_xen_proxy 0
%endif
-%if "%{fedora}"
+%if 0%{?fedora}
%ifarch ppc64
%define with_qemu 0
%endif