Please see
http://lists.fedoraproject.org/pipermail/devel/2011-April/150540.html

Julian's followup post gave an example of how to fix the scriptlet:

%postun
if [ $1 -eq 0 ] ; then
glib-compile-schemas %{_datadir}/glib-2.0/schemas &> /dev/null || :
fi

%posttrans
glib-compile-schemas %{_datadir}/glib-2.0/schemas &> /dev/null || :

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