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diff --git a/getopt_long.h b/getopt_long.h
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+/*
+  This getopt_long() is compatible with GNU's, however, added original
+  extention (short 1 byte option).
+
+
+  Copyright (c) 2004 Koji Arai
+
+  Permission is hereby granted, free of charge, to any person
+  obtaining a copy of this software and associated documentation files
+  (the "Software"), to deal in the Software without restriction,
+  including without limitation the rights to use, copy, modify, merge,
+  publish, distribute, sublicense, and/or sell copies of the Software,
+  and to permit persons to whom the Software is furnished to do so,
+  subject to the following conditions:
+
+  The above copyright notice and this permission notice shall be
+  included in all copies or substantial portions of the Software.
+
+  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+  ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+  SOFTWARE.
+*/
+
+#ifndef _GETOPT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct option {
+    const char *name;
+    int has_arg;
+
+    /* values of has_arg */
+#define no_argument             0
+#define required_argument       1
+#define optional_argument       2
+
+    int *flag;
+    int val;
+};
+
+extern char *optarg;
+extern int optind;
+
+int getopt_long(int argc, char **argv,
+                const char *shortopts,
+                struct option *longopts,
+                int *indexptr);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _GETOPT_H */