diff --git a/src/maxmin.h b/src/maxmin.h
new file mode 100644
--- /dev/null
+++ b/src/maxmin.h
@@ -0,0 +1,35 @@
+/*
+ *
+ *  $Id$
+ *
+ *  This file is part of the Virtual Leaf.
+ *
+ *  The Virtual Leaf 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.
+ *
+ *  The Virtual Leaf 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 the Virtual Leaf.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *  Copyright 2010 Roeland Merks.
+ *
+ */
+
+
+#ifndef _MAXMIN_H_
+#define _MAXMIN_H_
+
+#include <cmath>
+
+inline double FMAX(double a, double b) { return a>b ? a : b; }
+inline double FMIN(double a, double b) { return a<b ? a : b; }
+inline double SIGN(double a, double b) { return b>=0.0 ? fabs(a) : -fabs(a); }
+
+#endif
+