diff -ur GTorrentViewer-0.2b.orig/configure GTorrentViewer-0.2b/configure

--- GTorrentViewer-0.2b.orig/configure	2022-11-25 10:59:57.070030177 +0100

+++ GTorrentViewer-0.2b/configure	2022-11-25 11:01:15.931236749 +0100

@@ -3486,8 +3486,8 @@

   for (i = 0; i < 256; i++)

     if (XOR (islower (i), ISLOWER (i))

 	|| toupper (i) != TOUPPER (i))

-      exit(2);

-  exit (0);

+      return 2;

+  return 0;

 }

 _ACEOF

 rm -f conftest$ac_exeext