Removed obsolete stuff.
%clean section is now done automagically by RPM.
rm -rf %{buildroot} is no longer needed explicitly in %install as it is done automagically by RPM.
BuildRoot definition is no longer needed explicitly.
%defattr(-,root,root) is useless, should be removed.
Only use %defattr if you need to change the default upstream permissions.
Autoreqprov does not need to be explicitly enabled.