From Fedora Project Wiki
GSettings Schema
[Need a paragraph about what GSettings is, and what the glib-compile-schemas call is for]
%postun glib-compile-schemas %{_datadir}/glib-2.0/schemas &> /dev/null || : %posttrans glib-compile-schemas %{_datadir}/glib-2.0/schemas &> /dev/null || :
[If apps don't generate an automatic Requires on whatever is providing GSettings then we need to include a simple Requires: on the relevant package here.]