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diff --git a/src/glm/gtx/integer.inl b/src/glm/gtx/integer.inl
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+///////////////////////////////////////////////////////////////////////////////////////////////////
+// OpenGL Mathematics Copyright (c) 2005 - 2011 G-Truc Creation (www.g-truc.net)
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Created : 2005-12-24
+// Updated : 2006-12-06
+// Licence : This source is under MIT License
+// File    : glm/gtx/integer.inl
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+namespace glm{
+namespace gtx{
+namespace integer
+{
+    // pow
+    GLM_FUNC_QUALIFIER int pow(int x, int y)
+    {
+		if(y == 0)
+			return 1;
+        int result = x;
+        for(int i = 1; i < y; ++i)
+            result *= x;
+        return result;
+    }
+
+    // sqrt: From Christopher J. Musial, An integer square root, Graphics Gems, 1990, page 387
+    GLM_FUNC_QUALIFIER int sqrt(int x)
+    {
+        if(x <= 1) return x;
+
+        int NextTrial = x >> 1;
+        int CurrentAnswer;
+
+        do
+        {
+            CurrentAnswer = NextTrial;
+            NextTrial = (NextTrial + x / NextTrial) >> 1;
+        } while(NextTrial < CurrentAnswer);
+
+        return CurrentAnswer;
+    }
+
+    // mod
+	GLM_FUNC_QUALIFIER int mod(int x, int y)
+	{
+		return x - y * (x / y);
+	}
+
+    // factorial (!12 max, integer only)
+	template <typename genType>
+    GLM_FUNC_QUALIFIER genType factorial(genType const & x)
+    {
+		genType Temp = x;
+        genType Result;
+        for(Result = 1; Temp > 1; --Temp)
+            Result *= Temp;
+        return Result;
+    }
+
+	template <typename valType>
+    GLM_FUNC_QUALIFIER detail::tvec2<valType> factorial(
+		detail::tvec2<valType> const & x)
+    {
+        return detail::tvec2<valType>(
+            factorial(x.x),
+            factorial(x.y));
+    }
+
+	template <typename valType>
+    GLM_FUNC_QUALIFIER detail::tvec3<valType> factorial(
+		detail::tvec3<valType> const & x)
+    {
+        return detail::tvec3<valType>(
+            factorial(x.x),
+            factorial(x.y),
+            factorial(x.z));
+    }
+
+	template <typename valType>
+    GLM_FUNC_QUALIFIER detail::tvec4<valType> factorial(
+		detail::tvec4<valType> const & x)
+    {
+        return detail::tvec4<valType>(
+            factorial(x.x),
+            factorial(x.y),
+            factorial(x.z),
+            factorial(x.w));
+    }
+
+}//namespace integer
+}//namespace gtx
+}//namespace glm