$ git clone -n https://src.fedoraproject.org/rpms/ghc-rpm-macros.git /var/lib/mock/f37-build-7747-1492/root/chroot_tmpdir/scmroot/ghc-rpm-macros
Cloning into '/var/lib/mock/f37-build-7747-1492/root/chroot_tmpdir/scmroot/ghc-rpm-macros'...
$ git reset --hard b47d44f0861248282d1cd923d3abf80cd638d079
HEAD is now at b47d44f %ghc_set_gcc_flags: always sed CFLAGS whether pre-set or not