--- orig.cpp	2016-06-07 23:14:22.456677576 -0700
+++ cpp-tutorial-4-gles3-pointcloud.cpp	2016-06-07 23:09:17.081781589 -0700
@@ -33,6 +33,9 @@
         {
             // Open a GLFW window to display our output
             glfwInit();
+            glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
+            glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+            glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
             win_ = glfwCreateWindow(display_size_.width, display_size_.height,
                 "librealsense tutorial #4", nullptr, nullptr);
             glfwSetCursorPosCallback(win_, on_cursor_pos);