The install-info command in %preun of autogen is missing a trailing colon; it ends with "||", should be "|| :". http://fedoraproject.org/wiki/Packaging/ScriptletSnippets
Which version are you looking at? The install-info in rawhide (5.8.7-5) certainly has it on.
Looks like you fixed it one day after this bug was filed in 5.8.7-4 (CVS rev 1.6): http://cvs.fedora.redhat.com/viewcvs/devel/autogen/autogen.spec?root=extras&r1=1.5&r2=1.6
Yep. Now to fix gtksourceview-sharp, XaraLX and boo. boo is a bigger pain though :-(