diff --git a/preprocessor.h b/preprocessor.h
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--- /dev/null
+++ b/preprocessor.h
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+/*
+ * This file is part of libgim.
+ *
+ * libgim is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later
+ * version.
+ *
+ * libgim 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. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with libgim. If not, see .
+ *
+ * Copyright 2012 Danny Robson
+ */
+
+#ifndef __PREPROCESSOR_HPP
+#define __PREPROCESSOR_HPP
+
+#define CONCATENATE_DETAIL(x, y) x##y
+#define CONCATENATE(x, y) CONCATENATE_DETAIL(x, y)
+
+#endif