-glib_dep = dependency('glib-2.0', version : glib_req, fallback: ['glib', 'libglib_dep'])
-gio_dep = dependency('gio-2.0', version : glib_req, fallback: ['glib', 'libgio_dep'] )
-gmodule_dep = dependency('gmodule-2.0', version : glib_req, fallback: ['glib', 'libgmodule_dep'])