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diff --git a/src/engine/machina/Mutation.hpp b/src/engine/machina/Mutation.hpp
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+++ b/src/engine/machina/Mutation.hpp
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+/*
+  This file is part of Machina.
+  Copyright 2007-2013 David Robillard <http://drobilla.net>
+
+  Machina 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 any later version.
+
+  Machina 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 Machina.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef MACHINA_MACHINE_MUTATION_HPP
+#define MACHINA_MACHINE_MUTATION_HPP
+
+#include "machina_config.h"
+
+#ifdef HAVE_EUGENE
+#    include "eugene/Mutation.hpp"
+#    define SUPER : public eugene::Mutation<Machine>
+#else
+#    define SUPER : public Mutation
+#endif
+
+namespace machina {
+
+#ifdef HAVE_EUGENE
+typedef eugene::Random Random;
+#else
+struct Random {};
+#endif
+
+class Machine;
+
+namespace Mutation {
+
+struct Mutation {
+	virtual ~Mutation() {}
+
+	virtual void mutate(Random& rng, Machine& machine) = 0;
+};
+
+struct Compress   SUPER { void mutate(Random& rng, Machine& machine); };
+struct AddNode    SUPER { void mutate(Random& rng, Machine& machine); };
+struct RemoveNode SUPER { void mutate(Random& rng, Machine& machine); };
+struct AdjustNode SUPER { void mutate(Random& rng, Machine& machine); };
+struct SwapNodes  SUPER { void mutate(Random& rng, Machine& machine); };
+struct AddEdge    SUPER { void mutate(Random& rng, Machine& machine); };
+struct RemoveEdge SUPER { void mutate(Random& rng, Machine& machine); };
+struct AdjustEdge SUPER { void mutate(Random& rng, Machine& machine); };
+
+} // namespace Mutation
+
+} // namespace machina
+
+#endif // MACHINA_MACHINE_MUTATION_HPP