It makes a real difference in instances where strlcat() is actually implemented as a macro in system headers and <string.h> is included before "strequal.h" ... this will likely become more of a problem as more systems support _FORTIFY_SOURCE for strlcpy and strlcat which is being supported now on clang/llvm trunk.

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** [bugs:#1192] libcurl should use the strlcat from <string.h>**
**Status:** open
**Created:** Mon Feb 11, 2013 12:39 AM UTC by Jeremy Huddleston
**Last Updated:** Mon Feb 11, 2013 12:12 PM UTC
**Owner:** Daniel Stenberg
--- lib/strequal.h.orig	2013-02-08 09:04:39.000000000 -0800
+++ lib/strequal.h	2013-02-08 09:05:41.000000000 -0800
@@ -35,9 +35,10 @@
 /* case insensitive strstr() */
 char *Curl_strcasestr(const char *haystack, const char *needle);
 
-#ifndef HAVE_STRLCAT
+#ifdef HAVE_STRLCAT
+#include <string.h>
+#else
 #define strlcat(x,y,z) Curl_strlcat(x,y,z)
 #endif
-size_t strlcat(char *dst, const char *src, size_t siz);
 
 #endif
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