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diff --git a/passes/dfflibmap/libparse.h b/passes/dfflibmap/libparse.h
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+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2012  Clifford Wolf <clifford@clifford.at>
+ *  
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *  
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#ifndef LIBPARSE_H
+#define LIBPARSE_H
+
+#include <stdio.h>
+#include <string>
+#include <vector>
+#include <set>
+
+namespace PASS_DFFLIBMAP
+{
+	struct LibertyAst
+	{
+		std::string id, value;
+		std::vector<std::string> args;
+		std::vector<LibertyAst*> children;
+		~LibertyAst();
+		LibertyAst *find(std::string name);
+		void dump(FILE *f, std::string indent = "", std::string path = "", bool path_ok = false);
+		static std::set<std::string> blacklist;
+		static std::set<std::string> whitelist;
+	};
+
+	struct LibertyParer
+	{
+		FILE *f;
+		int line;
+		LibertyAst *ast;
+		LibertyParer(FILE *f) : f(f), line(1), ast(parse()) {}
+		~LibertyParer() { if (ast) delete ast; }
+		int lexer(std::string &str);
+		LibertyAst *parse();
+		void error();
+	};
+}
+
+#endif
+