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diff --git a/tclap-1.2.1/include/tclap/OptionalUnlabeledTracker.h b/tclap-1.2.1/include/tclap/OptionalUnlabeledTracker.h
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+++ b/tclap-1.2.1/include/tclap/OptionalUnlabeledTracker.h
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+
+
+/****************************************************************************** 
+ * 
+ *  file:  OptionalUnlabeledTracker.h
+ * 
+ *  Copyright (c) 2005, Michael E. Smoot .
+ *  All rights reverved.
+ * 
+ *  See the file COPYING in the top directory of this distribution for
+ *  more information.
+ *  
+ *  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 TCLAP_OPTIONAL_UNLABELED_TRACKER_H
+#define TCLAP_OPTIONAL_UNLABELED_TRACKER_H
+
+#include <string>
+
+namespace TCLAP {
+
+class OptionalUnlabeledTracker
+{
+
+	public:
+
+		static void check( bool req, const std::string& argName );
+
+		static void gotOptional() { alreadyOptionalRef() = true; }
+
+		static bool& alreadyOptional() { return alreadyOptionalRef(); } 
+
+	private:
+
+		static bool& alreadyOptionalRef() { static bool ct = false; return ct; }
+};
+
+
+inline void OptionalUnlabeledTracker::check( bool req, const std::string& argName )
+{
+    if ( OptionalUnlabeledTracker::alreadyOptional() )
+        throw( SpecificationException(
+	"You can't specify ANY Unlabeled Arg following an optional Unlabeled Arg",
+	                argName ) );
+
+    if ( !req )
+        OptionalUnlabeledTracker::gotOptional();
+}
+
+
+} // namespace TCLAP
+
+#endif