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diff --git a/include/math/math_util.h b/include/math/math_util.h
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+/*
+ * This program source code file is part of KICAD, a free EDA CAD application.
+ *
+ * Copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
+ * Copyright (C) CERN
+ * @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
+ *
+ * This program 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 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+#ifndef __MATH_UTIL_H
+#define __MATH_UTIL_H
+
+#include <stdint.h>
+
+/**
+ * Function rescale()
+ *
+ * Scales a number (value) by rational (numerator/denominator). Numerator must be <= denominator.
+ */
+
+template <typename T>
+T rescale( T aNumerator, T aValue, T aDenominator )
+{
+    return aNumerator * aValue / aDenominator;
+}
+
+template <typename T>
+int sign( T val )
+{
+    return ( T( 0 ) < val) - ( val < T( 0 ) );
+}
+
+// explicit specializations for integer types, taking care of overflow.
+template <>
+int rescale( int aNumerator, int aValue, int aDenominator );
+
+template <>
+int64_t rescale( int64_t aNumerator, int64_t aValue, int64_t aDenominator );
+
+#endif // __MATH_UTIL_H