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diff --git a/src/glm/gtx/norm.hpp b/src/glm/gtx/norm.hpp
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+///////////////////////////////////////////////////////////////////////////////////////////////////
+// OpenGL Mathematics Copyright (c) 2005 - 2011 G-Truc Creation (www.g-truc.net)
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Created : 2005-12-21
+// Updated : 2008-07-24
+// Licence : This source is under MIT License
+// File    : glm/gtx/norm.hpp
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// Dependency:
+// - GLM core
+// - GLM_GTX_quaternion
+///////////////////////////////////////////////////////////////////////////////////////////////////
+// ToDo:
+// - Study the validity of the notion of length2 to quaternion
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+#ifndef glm_gtx_norm
+#define glm_gtx_norm
+
+// Dependency:
+#include "../glm.hpp"
+#include "../gtx/quaternion.hpp"
+
+#if(defined(GLM_MESSAGES) && !defined(glm_ext))
+#	pragma message("GLM: GLM_GTX_norm extension included")
+#endif
+
+namespace glm{
+namespace gtx{
+namespace norm ///< GLM_GTX_norm extension: Various way to compute vector norms.
+{
+	/// \addtogroup gtx_norm
+	/// @{
+
+	//! Returns the squared length of x.
+	//! From GLM_GTX_norm extension.
+	template <typename T> 
+	T length2(
+		const T x);
+
+	//! Returns the squared length of x.
+	//! From GLM_GTX_norm extension.
+	template <typename T> 
+	T length2(
+		const detail::tvec2<T> & x);
+
+	//! Returns the squared length of x.
+	//! From GLM_GTX_norm extension.
+	template <typename T>
+	T length2(
+		const detail::tvec3<T>& x);
+		
+	//! Returns the squared length of x.
+	//! From GLM_GTX_norm extension.
+	template <typename T> 
+	T length2(
+		const detail::tvec4<T>& x);
+		
+	//! Returns the squared length of x.
+	//! From GLM_GTX_norm extension.
+	template <typename T>
+	T length2(
+		const detail::tquat<T>& q);
+
+	//! Returns the squared distance between p0 and p1, i.e., length(p0 - p1).
+	//! From GLM_GTX_norm extension.
+	template <typename T>
+	T distance2(
+		const T p0, 
+		const T p1);
+		
+	//! Returns the squared distance between p0 and p1, i.e., length(p0 - p1).
+	//! From GLM_GTX_norm extension.
+	template <typename T> 
+	T distance2(
+		const detail::tvec2<T>& p0, 
+		const detail::tvec2<T>& p1);
+
+	//! Returns the squared distance between p0 and p1, i.e., length(p0 - p1).
+	//! From GLM_GTX_norm extension.
+	template <typename T>
+	T distance2(
+		const detail::tvec3<T>& p0,
+		const detail::tvec3<T>& p1);
+
+	//! Returns the squared distance between p0 and p1, i.e., length(p0 - p1).
+	//! From GLM_GTX_norm extension.
+	template <typename T>
+	T distance2(
+		const detail::tvec4<T>& p0, 
+		const detail::tvec4<T>& p1);
+
+	//! Returns the L1 norm between x and y.
+	//! From GLM_GTX_norm extension.
+	template <typename T>
+	T l1Norm(
+		const detail::tvec3<T>& x,
+		const detail::tvec3<T>& y);
+		
+	//! Returns the L1 norm of v.
+	//! From GLM_GTX_norm extension.
+	template <typename T> 
+	T l1Norm(
+		const detail::tvec3<T>& v);
+		
+	//! Returns the L2 norm between x and y.
+	//! From GLM_GTX_norm extension.
+	template <typename T> 
+	T l2Norm(
+		const detail::tvec3<T>& x, 
+		const detail::tvec3<T>& y);
+		
+	//! Returns the L2 norm of v.
+	//! From GLM_GTX_norm extension.
+	template <typename T> 
+	T l2Norm(
+		const detail::tvec3<T>& x);
+		
+	//! Returns the L norm between x and y.
+	//! From GLM_GTX_norm extension.
+	template <typename T> 
+	T lxNorm(
+		const detail::tvec3<T>& x,
+		const detail::tvec3<T>& y,
+		unsigned int Depth);
+
+	//! Returns the L norm of v.
+	//! From GLM_GTX_norm extension.
+	template <typename T>
+	T lxNorm(
+		const detail::tvec3<T>& x,
+		unsigned int Depth);
+
+	/// @}
+}//namespace norm
+}//namespace gtx
+}//namespace glm
+
+#include "norm.inl"
+
+namespace glm{using namespace gtx::norm;}
+
+#endif//glm_gtx_norm