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diff --git a/ccan/hash/_info b/ccan/hash/_info
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+#include "config.h"
+#include <string.h>
+#include <stdio.h>
+
+/**
+ * hash - routines for hashing bytes
+ *
+ * When creating a hash table it's important to have a hash function
+ * which mixes well and is fast.  This package supplies such functions.
+ *
+ * The hash functions come in two flavors: the normal ones and the
+ * stable ones.  The normal ones can vary from machine-to-machine and
+ * may change if we find better or faster hash algorithms in future.
+ * The stable ones will always give the same results on any computer,
+ * and on any version of this package.
+ *
+ * License: CC0 (Public domain)
+ * Maintainer: Rusty Russell <rusty@rustcorp.com.au>
+ * Author: Bob Jenkins <bob_jenkins@burtleburtle.net>
+ */
+int main(int argc, char *argv[])
+{
+	if (argc != 2)
+		return 1;
+
+	if (strcmp(argv[1], "depends") == 0) {
+		printf("ccan/build_assert\n");
+		return 0;
+	}
+
+	return 1;
+}