[nkadel@nkadel-f23 python-py2pack-srpm]$ koji --debug build --scratch f24 rpmbuild/SRPMS/python-py2pack-0.4.10-0.1.fc23.src.rpm
BTW why don't you just ask package maintainer to update to the new version? You can find maintainers in pkgdb or ask zodbot [1]
Cheers, Alan
[1] https://admin.fedoraproject.org/pkgdb/package/python-py2pack/ <apevec> .whoowns python-py2pack <zodbot> apevec: hguemar (orphan in Fedora EPEL)