Trouble with libvirt 0.9.10 in Centos 6.3

Hi,
I tried to build new libvirt-0.9.10-21.el6_3.6.x86_64 with libvirt-spec-rhel6-enable-xen.patch in http://pasik.reaktio.net/xen/patches/libvirt-spec-rhel6-enable-xen.patch
I have failed in these problem :
# rpmbuild -bb libvirt.spec

ake[3]: *** [libvirt_driver_libxl_la-libxl_conf.lo] Error 1
make[3]: *** Waiting for unfinished jobs....
make[3]: Leaving directory `/root/rpmbuild/BUILD/libvirt-0.9.10/src'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/root/rpmbuild/BUILD/libvirt-0.9.10/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/root/rpmbuild/BUILD/libvirt-0.9.10'
make: *** [all] Error 2
error: Bad exit status from /var/tmp/rpm-tmp.Y4Abuu (%build)


RPM build errors:
Bad exit status from /var/tmp/rpm-tmp.Y4Abuu (%build)
Can some one help me fix this,
Many thanks,

 

http://www.howtoforge.com/forums/showthread.php?t=58994&highlight=xen+centos+6.3