rebase-helper is packaged in Fedora, so you can just install it with dnf.

If you can’t or don’t want to use rebase-helper package, you have to install, apart from Python requirements listed in get_requirements function in, the following dependencies:

Dependency Package name (in Fedora) Notes
git git for rebasing of downstream patches
rpmbuild rpm-build for building SRPM and for rpmbuild build tool
mock mock for mock build tool, optional
koji koji for koji build tool, optional
rpmdiff rpmlint for rpmdiff checker, optional
abipkgdiff libabigail for abipkgdiff checker, optional
pkgdiff pkgdiff for pkgdiff checker, optional
csmock csmock for csmock checker, optional