--- /dev/null
+/* CC0 (Public domain) - see LICENSE file for details */
+#ifndef CCAN_MEM_H
+#define CCAN_MEM_H
+
+#include "config.h"
+
+#include <string.h>
+
+#if !HAVE_MEMMEM
+void *memmem(const void *haystack, size_t haystacklen,
+ const void *needle, size_t needlelen);
+#endif
+
+#endif /* CCAN_MEM_H */