--- tmux-3.2a.orig/configure.ac	2021-06-10 10:20:51.000000000 +0200
+++ tmux-3.2a/configure.ac	2022-03-16 12:00:53.916934376 +0100
@@ -150,18 +150,10 @@ AC_REPLACE_FUNCS([ \
 	strlcpy \
 	strndup \
 	strsep \
+	strtonum \
 ])
 AC_FUNC_STRNLEN
 
-# Check if strtonum works.
-AC_MSG_CHECKING([for working strtonum])
-AC_RUN_IFELSE([AC_LANG_PROGRAM(
-         [#include <stdlib.h>],
-         [return (strtonum("0", 0, 1, NULL) == 0 ? 0 : 1);]
-	 )],
-	 [AC_DEFINE(HAVE_STRTONUM) AC_MSG_RESULT(yes)],
-	 [AC_LIBOBJ(strtonum) AC_MSG_RESULT(no)]
-)
 
 # Clang sanitizers wrap reallocarray even if it isn't available on the target
 # system. When compiled it always returns NULL and crashes the program. To