Aloas,
at http://fedoraproject.org/wiki/Packaging/Guidelines#head-69ef16dbc0ecb520d4cc... there is written:
| Packagers are highly encouraged to store libexecdir files in a | package-specific subdirectory of %{_libexecdir}, such | as %{_libexecdir}%{name}.
The last word should be: %{_libexecdir}/%{name}
Regards, Till