--- giscanner/transformer.py.orig	2026-02-10 15:15:42
+++ giscanner/transformer.py	2026-02-10 15:15:59
@@ -194,7 +194,7 @@
         searchdirs.append(os.path.join(DATADIR, 'gir-1.0'))
         if os.name != 'nt':
             # For backwards compatibility, was always unconditionally added to the list.
-            searchdirs.append('/usr/share/gir-1.0')
+            searchdirs.append('@PREFIX@/share/gir-1.0')
 
         girname = '%s-%s.gir' % (include.name, include.version)
         for d in searchdirs: