https://gitlab.com/muttmua/mutt/-/merge_requests/175

From 563c5f60521f1541b739480a5e242f6cd3a450ef Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Thu, 7 Dec 2023 19:39:06 +0100
Subject: [PATCH] configure.ac: Fix ICONV_NONTRANS probe

The standard iconv function uses char ** even for its input argument.
With a const char ** argument, ICONV_NONTRANS is incorrectly set to 1
if the compiler produces an error for such incompatible pointer types.

Although as far as I can see, the only thing that accomplishes is
disabling an assert, so it probably does not matter much.
--- a/configure.ac
+++ b/configure.ac
@@ -1325,10 +1325,10 @@ AC_CACHE_CHECK([whether iconv is non-transcribing], mutt_cv_iconv_nontrans,
 int main()
 {
   iconv_t cd;
-  const char *ib;
+  char *ib;
   char *ob;
   size_t ibl, obl;
-  const char *s = "\304\211";
+  char *s = (char *) "\304\211";
 changequote(, )dnl
   char t[3];
 changequote([, ])dnl
-- 
GitLab