diff --git a/btgui/OpenGLWindow/CMakeLists.txt b/btgui/OpenGLWindow/CMakeLists.txt
index 5d4460818..f552958bb 100644
--- a/btgui/OpenGLWindow/CMakeLists.txt
+++ b/btgui/OpenGLWindow/CMakeLists.txt
@@ -53,6 +53,13 @@ endif ()
 
 if (BUILD_SHARED_LIBS)
   target_link_libraries(OpenGLWindow Bullet3Common)
+  if (WIN32 OR APPLE)
+   target_link_libraries(OpenGLWindow ${OPENGL_gl_LIBRARY})
+  else()
+	set (CMAKE_THREAD_PREFER_PTHREAD TRUE)
+        FIND_PACKAGE(Threads)
+   	target_link_libraries(OpenGLWindow ${CMAKE_THREAD_LIBS_INIT})
+  endif()
 endif()
 
-target_link_libraries(OpenGLWindow ${OPENGL_gl_LIBRARY})
+#target_link_libraries(OpenGLWindow ${OPENGL_gl_LIBRARY})
diff --git a/src/BulletCollision/CollisionShapes/btTriangleMesh.cpp b/src/BulletCollision/CollisionShapes/btTriangleMesh.cpp
index 5fbed334e..e4de73209 100644
--- a/src/BulletCollision/CollisionShapes/btTriangleMesh.cpp
+++ b/src/BulletCollision/CollisionShapes/btTriangleMesh.cpp
@@ -75,6 +75,13 @@ void	btTriangleMesh::addIndex(int index)
 	}
 }
 
+void	btTriangleMesh::addTriangleIndices(int index1, int index2, int index3 )
+{
+	m_indexedMeshes[0].m_numTriangles++;
+	addIndex( index1 );
+	addIndex( index2 );
+	addIndex( index3 );
+}
 
 int	btTriangleMesh::findOrAddVertex(const btVector3& vertex, bool removeDuplicateVertices)
 {
diff --git a/src/BulletCollision/CollisionShapes/btTriangleMesh.h b/src/BulletCollision/CollisionShapes/btTriangleMesh.h
index 0afc2321f..ac4afa7f6 100644
--- a/src/BulletCollision/CollisionShapes/btTriangleMesh.h
+++ b/src/BulletCollision/CollisionShapes/btTriangleMesh.h
@@ -52,7 +52,10 @@ class btTriangleMesh : public btTriangleIndexVertexArray
 		///By default addTriangle won't search for duplicate vertices, because the search is very slow for large triangle meshes.
 		///In general it is better to directly use btTriangleIndexVertexArray instead.
 		void	addTriangle(const btVector3& vertex0,const btVector3& vertex1,const btVector3& vertex2, bool removeDuplicateVertices=false);
-		
+
+		///Add a triangle using its indices. Make sure the indices are pointing within the vertices array, so add the vertices first (and to be sure, avoid removal of duplicate vertices)	
+		void	addTriangleIndices(int index1, int index2, int index3 );
+	
 		int getNumTriangles() const;
 
 		virtual void	preallocateVertices(int numverts);