rubygem-curb fails to rebuild from source. See build failure at https://brewweb.devel.redhat.com/taskinfo?taskID=4104028 for details.
https://brewweb.devel.redhat.com/buildinfo?buildID=203362
I ran across this earlier when trying to build this package on EL6 (potentially for EPEL.) The error in mock: Checking for unpackaged file(s): /usr/lib/rpm/check-files /builddir/build/BUILDROOT/rubygem-curb-0.7.10-4.el6.i386 RPM build errors: error: Installed (but unpackaged) file(s) found: /usr/lib/ruby/gems/1.8/gems/curb-0.7.10/.require_paths Installed (but unpackaged) file(s) found: /usr/lib/ruby/gems/1.8/gems/curb-0.7.10/.require_paths It looks like the Fedora author originally excluded these files, but then dropped the exclusion in commit b650be2683.
rubygem-curb confirmed to be building correctly on x86_64 (the only arch where it is shipped with CloudForms) so closing this out. I suspect the issue was simply missing buildrequires in TPS as those needed to be installed by-hand as they are themselves part of the CloudForms release.