$ git clone -n https://src.fedoraproject.org/rpms/libcxxabi.git /var/lib/mock/f33-build-339285-58626/root/chroot_tmpdir/scmroot/libcxxabi
Cloning into '/var/lib/mock/f33-build-339285-58626/root/chroot_tmpdir/scmroot/libcxxabi'...
$ git reset --hard 8c8c7497b4390aed5cd823b6d7ce4fe16609e6d2
HEAD is now at 8c8c749 11.0.0-rc1 Release