libreoffice has a conditionally defined patch: %if 0%{?fedora} > 33 || 0%{?rhel} > 8 Patch5: 0001-Upgrade-liborcus-to-0.16.0.patch %endif As a result, when the SRPM is created on Fedora 33, the patch is not in it. When the SRPM is built on Fedora 34, it fails, because the fiel is missing: error: Bad file: /builddir/build/SOURCES/0001-Upgrade-liborcus-to-0.16.0.patch: No such file or directory As a consequence, we cannot easily rebuild libreoffice from dist git in Copr: https://pagure.io/copr/copr/issue/1315 A general sentiment seem to be that packages should avoid doing this, because it breaks stuff. I'll take a look to see if this can be designed in a more robust way.
My take to solve this problem: https://src.fedoraproject.org/rpms/libreoffice/pull-request/8