Changelog for xxhash-devel-0.6.3-2.fc26.x86_64.rpm :

* Thu Oct 19 2017 Mattias Ellert - 0.6.3-2- Correct License tag (command line tool is GPLv2+)- Adjust Source tag to get a more descriptive tarfile name
* Wed Oct 18 2017 Mattias Ellert - 0.6.3-1- Initial packaging