Comment # 2 on bug 98014 from Patrick Ohly

The current solution doesn't work - it captures the files created during
installation, which includes the build systems
/usr/share/glib-2.0/schemas/gschemas.compiled.

That's wrong, that file must not be included in the package. Instead, it needs
to be updated by calling glib-compile-schemas in a post[un]inst script.