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diff --git a/src/FbTk/RelCalcHelper.hh b/src/FbTk/RelCalcHelper.hh
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+++ b/src/FbTk/RelCalcHelper.hh
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+// RelCalcHelper.cc for Fluxbox - an X11 Window manager
+// Copyright (c) 2012 Lajos Koszti (ajnasz at ajnasz.hu)
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+#ifndef  FBTK_RELCALCHELPER_HH
+#define FBTK_RELCALCHELPER_HH
+
+#ifdef HAVE_CMATH
+  #include <cmath>
+#else
+  #include <math.h>
+#endif
+
+namespace FbTk {
+
+namespace RelCalcHelper {
+
+  int calPercentageOf(int i, int j);
+
+  int calPercentageValueOf(int i, int j);
+
+}
+
+}
+
+#endif // FBTK_RELCALCHELPER_HH