From 3481b82b6b796b4e0c6d2794880601a3924798cc Mon Sep 17 00:00:00 2001
From: Christophe Riccio <g.truc.creation@gmail.com>
Date: Thu, 3 Feb 2011 23:58:24 +0000
Subject: [PATCH 1/2] Added developer option

---
 CMakeLists.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e0007705..524241dc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,5 +8,9 @@ add_definitions(-D_CRT_SECURE_NO_WARNINGS)
 add_subdirectory(glm)
 add_subdirectory(doc)
 
+option(GLM_DEVELOPMENT_MODE "GLM development" OFF)
+if(NOT GLM_DEVELOPMENT_MODE)
+	message(FATAL_ERROR "GLM is a header only library, no need to build it")
+endif()
 
 

From 5b2e2e22857ee5c56c30bcd8cca37d600c4615f5 Mon Sep 17 00:00:00 2001
From: Christophe Riccio <g.truc.creation@gmail.com>
Date: Fri, 4 Feb 2011 10:57:03 +0000
Subject: [PATCH 2/2] Added multiplication operator

---
 glm/gtc/quaternion.hpp |  5 +++++
 glm/gtc/quaternion.inl | 14 ++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/glm/gtc/quaternion.hpp b/glm/gtc/quaternion.hpp
index f3c6fbc4..c70b1cde 100644
--- a/glm/gtc/quaternion.hpp
+++ b/glm/gtc/quaternion.hpp
@@ -76,6 +76,11 @@ namespace glm
 		detail::tquat<T> operator- (
 			detail::tquat<T> const & q);
 
+		template <typename T> 
+		detail::tquat<T> operator* ( 
+			detail::tquat<T> const & q, 
+			detail::tquat<T> const & p); 
+
 		template <typename T> 
 		detail::tvec3<T> operator* (
 			detail::tquat<T> const & q, 
diff --git a/glm/gtc/quaternion.inl b/glm/gtc/quaternion.inl
index d0344d14..a445c182 100644
--- a/glm/gtc/quaternion.inl
+++ b/glm/gtc/quaternion.inl
@@ -156,6 +156,20 @@ namespace detail{
 		return detail::tquat<T>(-q.w, -q.x, -q.y, -q.z);
 	}
 
+	template <typename T> 
+	inline detail::tquat<T> operator*
+	( 
+		detail::tquat<T> const & q, 
+		detail::tquat<T> const & p
+	) 
+	{ 
+        return detail::tquat<T>(
+            q.w * p.w - q.x * p.x - q.y * p.y - q.z * p.z,
+	        q.w * p.x + q.x * p.w + q.y * p.z - q.z * p.y,
+	        q.w * p.y + q.y * p.w + q.z * p.x - q.x * p.z,
+	        q.w * p.z + q.z * p.w + q.x * p.y - q.y * p.x);
+	} 
+
 	// Transformation
 	template <typename T>
 	inline detail::tvec3<T> operator*