This is needed by gnome-games-3.27.2.

I am not sure of the quality of this package, it looks OK to me but I probably got some details wrong. :)

+%define libmanette_binary_version 0.2

what for? the variable is never ever used after?

+%glib2_gsettings_schema_requires -- expands to %nil since we use file triggers. Drop it

+%post -n liblibmanette-0_2
+/sbin/ldconfig

also -p; no need to start bash here