$ git clone -n https://src.fedoraproject.org/rpms/openvdb.git /var/lib/mock/f40-build-780680-131108/root/chroot_tmpdir/scmroot/openvdb
Cloning into '/var/lib/mock/f40-build-780680-131108/root/chroot_tmpdir/scmroot/openvdb'...
$ git reset --hard b0daecbfdd3106701b333d7fa7917e450f63d5a2
HEAD is now at b0daecb i686 no longer builds due to 4GB memory per thread limitation on 32bit arches.