Changelog for fltk-devel-1.3.5-2.fc31.i686.rpm :

* Thu Jul 25 2019 Fedora Release Engineering - 1.3.5-2- Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild
* Sun Mar 03 2019 Richard Shaw - 1.3.5-1- Update to 1.3.5.
* Thu Jan 31 2019 Fedora Release Engineering - 1.3.4-8- Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild