diff '--color=auto' -ru pango-1.50.9/pango/serializer.c src/pango/serializer.c
--- pango-1.50.9/pango/serializer.c	2022-08-09 20:01:23.000000000 +0200
+++ src/pango/serializer.c	2022-08-23 18:00:41.369570351 +0200
@@ -1712,7 +1712,8 @@
         code = PANGO_LAYOUT_DESERIALIZE_INVALID;
 
       g_set_error (error, PANGO_LAYOUT_DESERIALIZE_ERROR, code,
-                   "%ld:%ld: %s", start, end, parser_error->message);
+                   "%" G_GSIZE_FORMAT ":%" G_GSIZE_FORMAT ": %s",
+                   start, end, parser_error->message);
 
       g_clear_object (&layout);
     }