--- /dev/null
+#include <stdio.h>
+#include <string.h>
+#include "config.h"
+
+/**
+ * err - err(), errx(), warn() and warnx(), as per BSD's err.h.
+ *
+ * A few platforms don't provide err.h; for those, this provides replacements.
+ * For most, it simple includes the system err.h.
+ *
+ * Example:
+ * #include <ccan/err/err.h>
+ *
+ * int main(int argc, char *argv[])
+ * {
+ * if (argc != 1)
+ * errx(1, "Expect no arguments");
+ * exit(0);
+ * }
+ *
+ * License: Public domain
+ * Author: Rusty Russell <rusty@rustcorp.com.au>
+ */
+int main(int argc, char *argv[])
+{
+ if (argc != 2)
+ return 1;
+
+ if (strcmp(argv[1], "depends") == 0) {
+#if !HAVE_ERR_H
+ printf("ccan/compiler\n");
+#endif
+ return 0;
+ }
+
+ return 1;
+}