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diff --git a/src/3rdparty/adaptagrams/libcola/exceptions.h b/src/3rdparty/adaptagrams/libcola/exceptions.h
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+/*
+ * vim: ts=4 sw=4 et tw=0 wm=0
+ *
+ * libcola - A library providing force-directed network layout using the 
+ *           stress-majorization method subject to separation constraints.
+ *
+ * Copyright (C) 2008  Monash University
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * See the file LICENSE.LGPL distributed with the library.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+*/
+
+#ifndef SEEN_LIBCOLA_EXCEPTIONS_H
+#define SEEN_LIBCOLA_EXCEPTIONS_H
+#include <string>
+#include <sstream>
+
+namespace cola {
+class CompoundConstraint;
+
+struct InvalidConstraint {
+    InvalidConstraint(CompoundConstraint *c):constraint(c) {}
+    CompoundConstraint *constraint;
+};
+
+
+class InvalidVariableIndexException
+{
+public:
+    InvalidVariableIndexException(CompoundConstraint *c, unsigned i) 
+        : constraint(c),
+          index(i)
+    { }
+    std::string what() const throw()
+    {
+        std::stringstream s;
+        s << "Invalid variable index: " << index;
+        return s.str();
+    }
+    CompoundConstraint *constraint;
+    unsigned index;
+};
+
+
+} // namespace cola
+#endif //SEEN_LIBCOLA_EXCEPTIONS_H