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 in squid-3.2.1-2.fc18.
squid-3.2.3-2.fc18 has been submitted as an update for Fedora 18. https://admin.fedoraproject.org/updates/FEDORA-2012-16962/squid-3.2.3-2.fc18
squid-3.2.3-2.fc17 has been submitted as an update for Fedora 17. https://admin.fedoraproject.org/updates/squid-3.2.3-2.fc17
squid-3.2.3-2.fc16 has been submitted as an update for Fedora 16. https://admin.fedoraproject.org/updates/squid-3.2.3-2.fc16
squid-3.2.3-2.fc17 has been pushed to the Fedora 17 stable repository. If problems still persist, please make note of it in this bug report.
squid-3.2.3-2.fc16 has been pushed to the Fedora 16 stable repository. If problems still persist, please make note of it in this bug report.