$ git clone -n https://src.fedoraproject.org/rpms/rxtx.git /var/lib/mock/f31-build-76882-31453/root/chroot_tmpdir/scmroot/rxtx
Cloning into '/var/lib/mock/f31-build-76882-31453/root/chroot_tmpdir/scmroot/rxtx'...
$ git reset --hard 55d85bd05bd141b114c6922f835b40f1f1d8f1c6
HEAD is now at 55d85bd Fix an undefined symbol error