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https://bugs.gentoo.org/952902
https://bugs.gentoo.org/955549
https://github.com/TeX-Live/texlive-source/commit/cc687b6c0ae8c6a4b566646282a7bc702d822e6d (cherry-picked)
.. then another fix on top.
From cc687b6c0ae8c6a4b566646282a7bc702d822e6d Mon Sep 17 00:00:00 2001
From: Karl Berry <karl@freefriends.org>
Date: Tue, 8 Apr 2025 22:40:48 +0000
Subject: [PATCH] begin groveling to C23 (fixes mostly from Hilmar)
git-svn-id: svn://tug.org/texlive/trunk/Build/source@74888 c570f23f-e606-0410-a88d-b1316a301751
---
texk/kpathsea/c-memstr.h | 7 -------
17 files changed, 81 insertions(+), 25 deletions(-)
diff --git a/texk/kpathsea/c-memstr.h b/texk/kpathsea/c-memstr.h
index e8e107a6f9..fdd4faeb7e 100644
--- a/c-memstr.h
+++ b/c-memstr.h
@@ -53,11 +53,4 @@
#define memcpy(to, from, len) bcopy ((from), (to), (len))
#endif
-#if !defined(HAVE_STRING_H)
-extern char *strtok ();
-#ifndef strstr
-extern char *strstr ();
-#endif
-#endif
-
#endif /* not KPATHSEA_C_MEMSTR_H */
diff --git a/c-std.h b/c-std.h
index 6d65d15..f001f0a 100644
--- a/c-std.h
+++ b/c-std.h
@@ -37,16 +37,10 @@
/* Be sure we have constants from <unistd.h>. */
#include <kpathsea/c-unistd.h>
-#ifdef HAVE_STDLIB_H
#include <stdlib.h>
/* Include <stdlib.h> before <stddef.h>, to help avoid NULL
redefinitions on some systems. (We don't include <stddef.h>
ourselves any more, but FYI.) */
-#else
-/* It's impossible to say for sure what the system will deign to put in
- <stdlib.h>, but let's hope it's at least this. */
-extern char *getenv ();
-#endif /* not HAVE_STDLIB_H */
#ifdef WIN32
#include <malloc.h>
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