--- /dev/null
+#include <stdio.h>
+#include <string.h>
+#include "config.h"
+
+/**
+ * opt - simple command line parsing
+ *
+ * Simple but powerful command line parsing, built on top of getopt_long.
+ *
+ * Example:
+ * #include <ccan/opt/opt.h>
+ * #include <stdio.h>
+ * #include <stdlib.h>
+ *
+ * static bool someflag;
+ * static int verbose;
+ * static char *somestring;
+ *
+ * static struct opt_table opts[] = {
+ * { OPT_WITHOUT_ARG("verbose", 'v', opt_inc_intval, &verbose),
+ * "Verbose mode (can be specified more than once)" },
+ * { OPT_WITHOUT_ARG("someflag", 0, opt_set_bool, &someflag),
+ * "Set someflag" },
+ * { OPT_WITH_ARG("somestring", 0, opt_set_charp, &somestring),
+ * "Set somestring to <arg>" },
+ * { OPT_WITHOUT_ARG("usage", 0, opt_usage_and_exit,
+ * "args...\nA silly test program."),
+ * "Print this message." },
+ * OPT_ENDTABLE
+ * };
+ *
+ * int main(int argc, char *argv[])
+ * {
+ * int i;
+ *
+ * opt_register_table(opts);
+ * // For fun, register an extra one.
+ * opt_register_noarg("no-someflag", 0, opt_set_invbool, &someflag,
+ * "Unset someflag");
+ * if (!opt_parse(&argc, argv, opt_log_stderr))
+ * exit(1);
+ *
+ * printf("someflag = %i, verbose = %i, somestring = %s\n",
+ * someflag, verbose, somestring);
+ * printf("%u args left over:", argc - 1);
+ * for (i = 1; i < argc; i++)
+ * printf(" %s", argv[i]);
+ * printf("\n");
+ * return 0;
+ * }
+ *
+ * Licence: GPL (3 or any later version)
+ * Author: Rusty Russell <rusty@rustcorp.com.au>
+ */
+int main(int argc, char *argv[])
+{
+ if (argc != 2)
+ return 1;
+
+ if (strcmp(argv[1], "depends") == 0) {
+ return 0;
+ }
+
+ return 1;
+}