I confirm that this update fixes the bug. I can build lilypond again. Thanks
Just to be sure, do you know that python3-poppler-qt5 exists? https://github.com/wbsoft/python-poppler-qt5
We just need a package in Fedora. This is a dependency of the new major version (3.0) of Frescobaldi, LilyPond editor.
I confirm that this update fixes the bug. I can build lilypond again. Thanks