https://tug.org/pipermail/tex-live/2024-November/050930.html
https://bugs.gentoo.org/944178
--- a/squeeze/squeeze.c
+++ b/squeeze/squeeze.c
@@ -118,7 +118,6 @@ main(int argc, char *argv[])
     int c;
     char *b;
     char seeking;
-    extern void exit();
 
     if (argc > 3 || (in = (argc < 2 ? stdin : fopen(argv[1], "r"))) == NULL ||
 	(out = (argc < 3 ? stdout : fopen(argv[2], "w"))) == NULL) {