Changelog for which-2.16-owl2.x86_64.rpm :

* Mon Jun 30 2014 (GalaxyMaster) 2.16-owl2- Replaced the deprecated PreReq tag with Requires(post,preun).
* Tue Jun 06 2006 Dmitry V. Levin 2.16-owl1- Updated to 2.16.- Packaged documentation in Info format.
* Sat Feb 02 2002 Solar Designer 2.12-owl2- Enforce our new spec file conventions.
* Sun Nov 19 2000 Michail Litvak - Imported from RH.- update to 2.12