Fedora 18 changes the way how to work with services in spec files. It introduces new macros - %systemd_post, %systemd_preun and %systemd_postun; which replace scriptlets from Fedora 17 and older (see https://fedoraproject.org/wiki/Packaging:ScriptletSnippets#Systemd, https://bugzilla.redhat.com/show_bug.cgi?id=850016).
Fixed this in git, committed and pushed as hail-0.8-0.11.gf9c5b967, but cannot build due to a random conflict in Rawhide (gcc vs libtool).
Hmm, weird. Apparently I did build hail-0.8-0.13.gf9c5b967.fc19 after all. Anyway, fixed in hail-0.8-0.13.gf9c5b967.fc20, closing.