Hello, we are working on getting Kalzium in Fedora, but it does look like many of it's components do not build against Eigen3 v5.
A possibly relevant merge request was started @ https://invent.kde.org/education/kalzium/-/merge_requests/65
Git commit 61cdabb2b72f3091f39440d34e28cc158cf1d98e by Albert Astals Cid, on behalf of Antonio Rojas. Committed on 07/11/2025 at 10:21. Pushed by aacid into branch 'master'. Fix build of Eigen-dependent parts with Eigen 5 Eigen 5 cmake config no longer provides the uppercase EIGEN3_FOUND variable M +2 -2 CMakeLists.txt M +2 -2 src/CMakeLists.txt https://invent.kde.org/education/kalzium/-/commit/61cdabb2b72f3091f39440d34e28cc158cf1d98e
Git commit d4f6daa945a21ba52216eeefd14974a79f49108a by Albert Astals Cid, on behalf of Antonio Rojas. Committed on 07/11/2025 at 12:23. Pushed by aacid into branch 'release/25.12'. Fix build of Eigen-dependent parts with Eigen 5 Eigen 5 cmake config no longer provides the uppercase EIGEN3_FOUND variable (cherry picked from commit 61cdabb2b72f3091f39440d34e28cc158cf1d98e) M +2 -2 CMakeLists.txt M +2 -2 src/CMakeLists.txt https://invent.kde.org/education/kalzium/-/commit/d4f6daa945a21ba52216eeefd14974a79f49108a