Changelog for yacas-gui-1.9.1-lp155.2.7.x86_64.rpm :

* Wed Jan 25 2023 Adrian Vontobel 1.9.1-1- Update source to 1.9.1
* Thu Nov 07 2019 Adrian Vontobel 1.8.0-1- Adapt spec file for openSUSE
* Thu Feb 15 2018 Grzegorz Mazur 1.8.0-1- Changes are none, there is only the now (Ayal Pinkus)