From: micro-ROS NuttX Port <noreply@nuttx.apache.org>
Subject: [PATCH] rcutils: include <strings.h> for strcasecmp on NuttX

POSIX specifies strcasecmp/strncasecmp in <strings.h>, not <string.h>.
NuttX follows the standard strictly so omitting this header causes an
"implicit declaration" error.  Guard the include with __NuttX__ so it
only applies where needed and does not affect Linux or other platforms
that already expose strcasecmp through <string.h>.

--- a/rcutils/src/strcasecmp.c
+++ b/rcutils/src/strcasecmp.c
@@ -17,6 +17,9 @@ extern "C"
 #include <errno.h>
 #include <string.h>
+#ifdef __NuttX__
+#include <strings.h>
+#endif

 #include "rcutils/strcasecmp.h"