diff --git a/examples/ExampleBrowser/OpenGLExampleBrowser.cpp b/examples/ExampleBrowser/OpenGLExampleBrowser.cpp
index 69842d4c7..fb13df898 100644
--- a/examples/ExampleBrowser/OpenGLExampleBrowser.cpp
+++ b/examples/ExampleBrowser/OpenGLExampleBrowser.cpp
@@ -13,7 +13,11 @@
 #include "../OpenGLWindow/Win32OpenGLWindow.h"
 #else
 //let's cross the fingers it is Linux/X11
+#ifdef BT_USE_EGL
+#include "../OpenGLWindow/EGLOpenGLWindow.h"
+#else
 #include "../OpenGLWindow/X11OpenGLWindow.h"
+#endif //BT_USE_EGL
 #endif //_WIN32
 #endif//__APPLE__
 #include "../ThirdPartyLibs/Gwen/Renderers/OpenGL_DebugFont.h"
diff --git a/examples/OpenGLWindow/EGLOpenGLWindow.cpp b/examples/OpenGLWindow/EGLOpenGLWindow.cpp
index d5a8c70df..3d6307aed 100644
--- a/examples/OpenGLWindow/EGLOpenGLWindow.cpp
+++ b/examples/OpenGLWindow/EGLOpenGLWindow.cpp
@@ -1,5 +1,5 @@
 
-//portions of this file are copied from GLFW egl_context.c/egl_context.h
+// portions of this file are copied from GLFW egl_context.c/egl_context.h
 
 //========================================================================
 // GLFW 3.3 EGL - www.glfw.org
@@ -30,178 +30,231 @@
 
 #ifdef BT_USE_EGL
 
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "OpenGLInclude.h"
+
+#include "third_party/GL/EGL/egl.h"
+#include "third_party/GL/gl/include/EGL/eglext.h"
+#include "third_party/GL/gl/include/GL/gl.h"
+
 #include "EGLOpenGLWindow.h"
 
-
-struct EGLInternalData2
-{
+struct EGLInternalData2 {
     bool m_isInitialized;
     
     int m_windowWidth;
     int m_windowHeight;
     
-    b3KeyboardCallback  m_keyboardCallback;
+    b3KeyboardCallback m_keyboardCallback;
     b3WheelCallback m_wheelCallback;
     b3ResizeCallback m_resizeCallback;
     b3MouseButtonCallback m_mouseButtonCallback;
     b3MouseMoveCallback m_mouseMoveCallback;
     
+    EGLBoolean success;
+    EGLint num_configs;
+    EGLConfig egl_config;
+    EGLSurface egl_surface;
+    EGLContext egl_context;
+    EGLDisplay egl_display;
+    
     EGLInternalData2()
-    :m_isInitialized(false),
+    : m_isInitialized(false),
     m_windowWidth(0),
     m_windowHeight(0),
     m_keyboardCallback(0),
     m_wheelCallback(0),
     m_resizeCallback(0),
     m_mouseButtonCallback(0),
-    m_mouseMoveCallback(0)
-    {
-        
-    }
+    m_mouseMoveCallback(0) {}
 };
 
-EGLOpenGLWindow::EGLOpenGLWindow()
-{
-    m_data = new EGLInternalData2();
+EGLOpenGLWindow::EGLOpenGLWindow() { m_data = new EGLInternalData2(); }
+
+EGLOpenGLWindow::~EGLOpenGLWindow() { delete m_data; }
+
+void EGLOpenGLWindow::createWindow(const b3gWindowConstructionInfo& ci) {
+    m_data->m_windowWidth = ci.m_width;
+    m_data->m_windowHeight = ci.m_height;
     
-}
-
-EGLOpenGLWindow::~EGLOpenGLWindow()
-{
-    delete m_data;
-}
-
-
-void	EGLOpenGLWindow::createWindow(const b3gWindowConstructionInfo& ci)
-{
+    EGLint egl_config_attribs[] = {EGL_RED_SIZE,
+        8,
+        EGL_GREEN_SIZE,
+        8,
+        EGL_BLUE_SIZE,
+        8,
+        EGL_DEPTH_SIZE,
+        8,
+        EGL_SURFACE_TYPE,
+        EGL_PBUFFER_BIT,
+        EGL_RENDERABLE_TYPE,
+        EGL_OPENGL_BIT,
+        EGL_NONE};
     
-}
-
-void	EGLOpenGLWindow::closeWindow()
-{
+    EGLint egl_pbuffer_attribs[] = {
+        EGL_WIDTH, m_data->m_windowWidth, EGL_HEIGHT, m_data->m_windowHeight,
+        EGL_NONE,
+    };
     
-}
-
-void	EGLOpenGLWindow::runMainLoop()
-{
+    // Initialize EGL display
+    PFNEGLQUERYDEVICESEXTPROC eglQueryDevicesEXT =
+    (PFNEGLQUERYDEVICESEXTPROC)eglGetProcAddress("eglQueryDevicesEXT");
+    if (eglQueryDevicesEXT == nullptr) m_data->egl_display = EGL_NO_DISPLAY;
     
-}
-
-float	EGLOpenGLWindow::getTimeInSeconds()
-{
-    return 0.;
-}
-
-bool	EGLOpenGLWindow::requestedExit() const
-{
-    return false;
-}
-
-void	EGLOpenGLWindow::setRequestExit()
-{
+    PFNEGLGETPLATFORMDISPLAYEXTPROC eglGetPlatformDisplayEXT =
+    (PFNEGLGETPLATFORMDISPLAYEXTPROC)eglGetProcAddress(
+                                                       "eglGetPlatformDisplayEXT");
+    if (eglGetPlatformDisplayEXT == nullptr) m_data->egl_display = EGL_NO_DISPLAY;
     
-}
-
-void	EGLOpenGLWindow::startRendering()
-{
+    const int max_devices = 32;
+    EGLDeviceEXT egl_devices[max_devices];
+    EGLint num_devices = 0;
+    EGLint egl_error = eglGetError();
+    if (!eglQueryDevicesEXT(max_devices, egl_devices, &num_devices) ||
+        egl_error != EGL_SUCCESS) {
+        printf("eglQueryDevicesEXT Failed.\n");
+        m_data->egl_display = EGL_NO_DISPLAY;
+    }
     
-}
-
-void	EGLOpenGLWindow::endRendering()
-{
+    for (EGLint i = 0; i < num_devices; ++i) {
+        EGLDisplay display = eglGetPlatformDisplayEXT(EGL_PLATFORM_DEVICE_EXT,
+                                                      egl_devices[i], nullptr);
+        if (eglGetError() == EGL_SUCCESS && display != EGL_NO_DISPLAY) {
+            int major, minor;
+            EGLBoolean initialized = eglInitialize(display, &major, &minor);
+            if (eglGetError() == EGL_SUCCESS && initialized == EGL_TRUE) {
+                m_data->egl_display = display;
+            }
+        }
+    }
     
+    m_data->success = eglBindAPI(EGL_OPENGL_API);
+    if (!m_data->success) {
+        printf("Failed to bind OpenGL API.\n");
+        exit(0);
+    }
+    
+    m_data->success =
+    eglChooseConfig(m_data->egl_display, egl_config_attribs,
+                    &m_data->egl_config, 1, &m_data->num_configs);
+    if (!m_data->success) {
+        printf("Failed to choose a valid an EGLConfig.\n");
+        exit(0);
+    }
+    
+    m_data->egl_surface = eglCreatePbufferSurface(
+                                                  m_data->egl_display, m_data->egl_config, egl_pbuffer_attribs);
+    
+    m_data->egl_context = eglCreateContext(
+                                           m_data->egl_display, m_data->egl_config, EGL_NO_CONTEXT, nullptr);
+    
+    eglMakeCurrent(m_data->egl_display, m_data->egl_surface, m_data->egl_surface,
+                   m_data->egl_context);
+    printf("Finish creating EGL OpenGL window.\n");
+    
+    const GLubyte* ven = glGetString(GL_VENDOR);
+    printf("GL_VENDOR=%s\n", ven);
+    
+    const GLubyte* ren = glGetString(GL_RENDERER);
+    printf("GL_RENDERER=%s\n", ren);
+    const GLubyte* ver = glGetString(GL_VERSION);
+    printf("GL_VERSION=%s\n", ver);
+    const GLubyte* sl = glGetString(GL_SHADING_LANGUAGE_VERSION);
+    printf("GL_SHADING_LANGUAGE_VERSION=%s\n", sl);
+    
+    int i = pthread_getconcurrency();
+    printf("pthread_getconcurrency()=%d\n", i);
 }
 
-bool	EGLOpenGLWindow::isModifierKeyPressed(int key)
-{
-    return false;
+void EGLOpenGLWindow::closeWindow() {
+    eglMakeCurrent(m_data->egl_display, EGL_NO_SURFACE, EGL_NO_SURFACE,
+                   EGL_NO_CONTEXT);
+    eglDestroySurface(m_data->egl_display, m_data->egl_surface);
+    eglDestroyContext(m_data->egl_display, m_data->egl_context);
+    printf("Destroy EGL OpenGL window.\n");
 }
 
-void EGLOpenGLWindow::setMouseMoveCallback(b3MouseMoveCallback	mouseCallback)
-{
+void EGLOpenGLWindow::runMainLoop() {}
+
+float EGLOpenGLWindow::getTimeInSeconds() { return 0.; }
+
+bool EGLOpenGLWindow::requestedExit() const { return false; }
+
+void EGLOpenGLWindow::setRequestExit() {}
+
+void EGLOpenGLWindow::startRendering() {
+    // printf("EGL window start rendering.\n");
+    glViewport(0, 0, m_data->m_windowWidth, m_data->m_windowHeight);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+    glEnable(GL_DEPTH_TEST);
+}
+
+void EGLOpenGLWindow::endRendering() {
+    // printf("EGL window end rendering.\n");
+    eglSwapBuffers(m_data->egl_display, m_data->egl_surface);
+}
+
+bool EGLOpenGLWindow::isModifierKeyPressed(int key) { return false; }
+
+void EGLOpenGLWindow::setMouseMoveCallback(b3MouseMoveCallback mouseCallback) {
     m_data->m_mouseMoveCallback = mouseCallback;
 }
 
-b3MouseMoveCallback EGLOpenGLWindow::getMouseMoveCallback()
-{
+b3MouseMoveCallback EGLOpenGLWindow::getMouseMoveCallback() {
     return m_data->m_mouseMoveCallback;
 }
 
-
-void EGLOpenGLWindow::setMouseButtonCallback(b3MouseButtonCallback	mouseCallback)
-{
+void EGLOpenGLWindow::setMouseButtonCallback(
+                                             b3MouseButtonCallback mouseCallback) {
     m_data->m_mouseButtonCallback = mouseCallback;
 }
 
-b3MouseButtonCallback EGLOpenGLWindow::getMouseButtonCallback()
-{
+b3MouseButtonCallback EGLOpenGLWindow::getMouseButtonCallback() {
     return m_data->m_mouseButtonCallback;
 }
 
-void EGLOpenGLWindow::setResizeCallback(b3ResizeCallback	resizeCallback)
-{
+void EGLOpenGLWindow::setResizeCallback(b3ResizeCallback resizeCallback) {
     m_data->m_resizeCallback = resizeCallback;
 }
 
-b3ResizeCallback EGLOpenGLWindow::getResizeCallback()
-{
+b3ResizeCallback EGLOpenGLWindow::getResizeCallback() {
     return m_data->m_resizeCallback;
 }
 
-void EGLOpenGLWindow::setWheelCallback(b3WheelCallback wheelCallback)
-{
+void EGLOpenGLWindow::setWheelCallback(b3WheelCallback wheelCallback) {
     m_data->m_wheelCallback = wheelCallback;
 }
 
-b3WheelCallback EGLOpenGLWindow::getWheelCallback()
-{
+b3WheelCallback EGLOpenGLWindow::getWheelCallback() {
     return m_data->m_wheelCallback;
 }
 
-void EGLOpenGLWindow::setKeyboardCallback( b3KeyboardCallback	keyboardCallback)
-{
+void EGLOpenGLWindow::setKeyboardCallback(b3KeyboardCallback keyboardCallback) {
     m_data->m_keyboardCallback = keyboardCallback;
 }
 
-b3KeyboardCallback	EGLOpenGLWindow::getKeyboardCallback()
-{
+b3KeyboardCallback EGLOpenGLWindow::getKeyboardCallback() {
     return m_data->m_keyboardCallback;
 }
 
-void EGLOpenGLWindow::setRenderCallback( b3RenderCallback renderCallback)
-{
-    
-}
-void EGLOpenGLWindow::setWindowTitle(const char* title)
-{
-    
-}
+void EGLOpenGLWindow::setRenderCallback(b3RenderCallback renderCallback) {}
+void EGLOpenGLWindow::setWindowTitle(const char* title) {}
 
-float	EGLOpenGLWindow::getRetinaScale() const
-{
-    return 1.f;
-}
+float EGLOpenGLWindow::getRetinaScale() const { return 1.f; }
 
-void	EGLOpenGLWindow::setAllowRetina(bool allow)
-{
-    
-}
+void EGLOpenGLWindow::setAllowRetina(bool allow) {}
 
+int EGLOpenGLWindow::getWidth() const { return m_data->m_windowWidth; }
 
-int   EGLOpenGLWindow::getWidth() const
-{
-    return m_data->m_windowWidth;
-}
+int EGLOpenGLWindow::getHeight() const { return m_data->m_windowHeight; }
 
-int   EGLOpenGLWindow::getHeight() const
-{
-    return m_data->m_windowHeight;
-}
-
-int EGLOpenGLWindow::fileOpenDialog(char* fileName, int maxFileNameLength)
-{
+int EGLOpenGLWindow::fileOpenDialog(char* fileName, int maxFileNameLength) {
     return 0;
 }
 
-#endif //BT_USE_EGL
-
+#endif  // BT_USE_EGL
diff --git a/examples/OpenGLWindow/GLInstancingRenderer.cpp b/examples/OpenGLWindow/GLInstancingRenderer.cpp
index 8d8a8170f..d5262db8b 100644
--- a/examples/OpenGLWindow/GLInstancingRenderer.cpp
+++ b/examples/OpenGLWindow/GLInstancingRenderer.cpp
@@ -31,13 +31,17 @@ float shadowMapWorldSize=10;
 
 #ifndef __APPLE__
 #ifndef glVertexAttribDivisor
+#ifndef NO_GLEW
 #define glVertexAttribDivisor glVertexAttribDivisorARB
+#endif //NO_GLEW
 #endif //glVertexAttribDivisor
 #ifndef GL_COMPARE_REF_TO_TEXTURE
 #define GL_COMPARE_REF_TO_TEXTURE GL_COMPARE_R_TO_TEXTURE
 #endif //GL_COMPARE_REF_TO_TEXTURE
 #ifndef glDrawElementsInstanced
+#ifndef NO_GLEW
 #define glDrawElementsInstanced glDrawElementsInstancedARB
+#endif //NO_GLEW
 #endif
 #endif //__APPLE__
 #include "GLInstancingRenderer.h"
diff --git a/examples/OpenGLWindow/OpenGL2Include.h b/examples/OpenGLWindow/OpenGL2Include.h
index 34caaaf07..0d3f4701b 100644
--- a/examples/OpenGLWindow/OpenGL2Include.h
+++ b/examples/OpenGLWindow/OpenGL2Include.h
@@ -27,8 +27,14 @@ subject to the following restrictions:
 #ifdef GLEW_STATIC
 #include "CustomGL/glew.h"
 #else
+#ifdef NO_GLEW
+#define GL_GLEXT_LEGACY
+#include "third_party/GL/gl/include/GL/gl.h"
+#include "third_party/GL/gl/include/GL/glext.h"
+#else
 #include <GL/glew.h>
-#endif//GLEW_STATIC
+#endif //NO_GLEW
+#endif //GLEW_STATIC
 
 #ifdef _WINDOWS
 #include <windows.h>
diff --git a/examples/OpenGLWindow/OpenGLInclude.h b/examples/OpenGLWindow/OpenGLInclude.h
index 19219a188..c9c1503d6 100644
--- a/examples/OpenGLWindow/OpenGLInclude.h
+++ b/examples/OpenGLWindow/OpenGLInclude.h
@@ -34,7 +34,13 @@ subject to the following restrictions:
 #ifdef GLEW_STATIC
 #include "CustomGL/glew.h"
 #else
+#ifdef NO_GLEW
+#define GL_GLEXT_LEGACY
+#include "third_party/GL/gl/include/GL/gl.h"
+#include "third_party/GL/gl/include/GL/glext.h"
+#else
 #include <GL/glew.h>
+#endif //NO_GLEW
 #endif //GLEW_STATIC
 
 #ifdef _WINDOWS
diff --git a/examples/OpenGLWindow/SimpleOpenGL2App.cpp b/examples/OpenGLWindow/SimpleOpenGL2App.cpp
index bd491c782..b2caaf3d7 100644
--- a/examples/OpenGLWindow/SimpleOpenGL2App.cpp
+++ b/examples/OpenGLWindow/SimpleOpenGL2App.cpp
@@ -20,7 +20,11 @@
 #include "Win32OpenGLWindow.h"
 #else
 //let's cross the fingers it is Linux/X11
+#ifdef BT_USE_EGL
+#include "EGLOpenGLWindow.h"
+#else
 #include "X11OpenGLWindow.h"
+#endif //BT_USE_EGL
 #endif //_WIN32
 #endif//__APPLE__
 #include <stdio.h>
@@ -115,25 +119,27 @@ SimpleOpenGL2App::SimpleOpenGL2App(const char* title, int width, int height)
 	m_window->setWindowTitle(title);
 
 
+#ifndef NO_GLEW
 #ifndef __APPLE__
 #ifndef _WIN32
-//some Linux implementations need the 'glewExperimental' to be true
+    //some Linux implementations need the 'glewExperimental' to be true
     glewExperimental = GL_TRUE;
-#endif
-
-
+#endif //_WIN32
+    
+    
     if (glewInit() != GLEW_OK)
-	{
+    {
         b3Error("glewInit failed");
-		exit(1);
-	}
+        exit(1);
+    }
     if (!GLEW_VERSION_2_1)  // check that the machine supports the 2.1 API.
-	{
-		b3Error("GLEW_VERSION_2_1 needs to support 2_1");
-		exit(1); // or handle the error in a nicer way
-	}
-
-#endif
+    {
+        b3Error("GLEW_VERSION_2_1 needs to support 2_1");
+        exit(1); // or handle the error in a nicer way
+    }
+    
+#endif //__APPLE__
+#endif //NO_GLEW
 
 	
 	TwGenerateDefaultFonts();
diff --git a/examples/OpenGLWindow/SimpleOpenGL3App.cpp b/examples/OpenGLWindow/SimpleOpenGL3App.cpp
index c8d8f2a45..e7c51fe15 100644
--- a/examples/OpenGLWindow/SimpleOpenGL3App.cpp
+++ b/examples/OpenGLWindow/SimpleOpenGL3App.cpp
@@ -12,7 +12,11 @@
 #include "Win32OpenGLWindow.h"
 #else
 //let's cross the fingers it is Linux/X11
+#ifdef BT_USE_EGL
+#include "EGLOpenGLWindow.h"
+#else
 #include "X11OpenGLWindow.h"
+#endif //BT_USE_EGL
 #endif //_WIN32
 #endif//__APPLE__
 #include <stdio.h>
@@ -151,19 +155,21 @@ SimpleOpenGL3App::SimpleOpenGL3App(	const char* title, int width,int height, boo
     
 	b3Assert(glGetError() ==GL_NO_ERROR);
 
+#ifndef NO_GLEW
 #ifndef __APPLE__
 #ifndef _WIN32
-//some Linux implementations need the 'glewExperimental' to be true
+    //some Linux implementations need the 'glewExperimental' to be true
     glewExperimental = GL_TRUE;
-#endif
-
-
+#endif //_WIN32
+    
+    
     if (glewInit() != GLEW_OK)
         exit(1); // or handle the error in a nicer way
     if (!GLEW_VERSION_2_1)  // check that the machine supports the 2.1 API.
         exit(1); // or handle the error in a nicer way
-
-#endif
+    
+#endif //__APPLE__
+#endif //NO_GLEW
     glGetError();//don't remove this call, it is needed for Ubuntu
 
     b3Assert(glGetError() ==GL_NO_ERROR);
diff --git a/examples/ThirdPartyLibs/Gwen/Renderers/OpenGL_DebugFont.cpp b/examples/ThirdPartyLibs/Gwen/Renderers/OpenGL_DebugFont.cpp
index bf876b475..83012951e 100644
--- a/examples/ThirdPartyLibs/Gwen/Renderers/OpenGL_DebugFont.cpp
+++ b/examples/ThirdPartyLibs/Gwen/Renderers/OpenGL_DebugFont.cpp
@@ -10,12 +10,18 @@
 	#include <OpenGL/OpenGL.h>
 	#include <OpenGL/gl.h>
 #else
-	#ifdef GLEW_STATIC
-	#include "CustomGL/glew.h"
-	#else
-	#include <GL/glew.h>
-	#endif
-#endif
+#ifdef GLEW_STATIC
+#include "CustomGL/glew.h"
+#else
+#ifdef NO_GLEW
+#define GL_GLEXT_LEGACY
+#include "third_party/GL/gl/include/GL/gl.h"
+#include "third_party/GL/gl/include/GL/glext.h"
+#else
+#include <GL/glew.h>
+#endif //NO_GLEW
+#endif //GLEW_STATIC
+#endif//(__APPLE__)
 
 #include "FontData.h"