Description of problem:
flumotion doesn't build under current devel/fc5 mock due to gstreamer changes

End of mock build.log: 

checking for pkg-config... /usr/bin/pkg-config
checking for gstreamer-0.8 >= 0.8.7... Package gstreamer-0.8 was not found in
the pkg-config search path. Perhaps you should add the directory containing
`gstreamer-0.8.pc' to the PKG_CONFIG_PATH environment variable No package
'gstreamer-0.8' found
configure: error: Library requirements (gstreamer-0.8 >= 0.8.7) not met;
consider adjusting the PKG_CONFIG_PATH environment variable if your libraries
are in a nonstandard prefix so pkg-config can find them.
error: Bad exit status from /var/tmp/rpm-tmp.77542 (%build)


RPM build errors:
    Bad exit status from /var/tmp/rpm-tmp.77542 (%build)

This seems due to gstreamer package changes recently. 

Full build.log on request.