diff -ur postgresql-15.4/src/pl/plperl/expected/plperl_call.out postgresql-patched/src/pl/plperl/expected/plperl_call.out
--- postgresql-15.4/src/pl/plperl/expected/plperl_call.out	2023-08-07 22:08:18.000000000 +0200
+++ postgresql-patched/src/pl/plperl/expected/plperl_call.out	2023-09-18 10:23:42.499078442 +0200
@@ -64,6 +64,7 @@
   RAISE NOTICE '_a: %, _b: %', _a, _b;
 END
 $$;
+WARNING:  could not determine encoding for locale "C.UTF-8": codeset is "ANSI_X3.4-1968"
 NOTICE:  a: 10, b: 
 NOTICE:  _a: 10, _b: 20
 DROP PROCEDURE test_proc1;
diff -ur postgresql-15.4/src/pl/plperl/expected/plperl_elog_1.out postgresql-patched/src/pl/plperl/expected/plperl_elog_1.out
--- postgresql-15.4/src/pl/plperl/expected/plperl_elog_1.out	2023-08-07 22:08:18.000000000 +0200
+++ postgresql-patched/src/pl/plperl/expected/plperl_elog_1.out	2023-09-18 10:24:39.233451395 +0200
@@ -76,6 +76,7 @@
   RETURN 1;
 END;
 $$;
+WARNING:  could not determine encoding for locale "C.UTF-8": codeset is "ANSI_X3.4-1968"
 select die_caller();
 NOTICE:  caught die
  die_caller 
Only in postgresql-patched/src/pl/plperl/expected: plperl_warning.patch