diff --git a/doc/Changelog.md b/doc/Changelog.md
index 982d21441a..a72791d231 100644
--- a/doc/Changelog.md
+++ b/doc/Changelog.md
@@ -3,6 +3,8 @@ Changelog {#Changelog}
 
 # git master {#master}
 
+* [473](https://github.com/Eyescale/Equalizer/pull/473)
+  Fix OS X OpenGL detection
 * [463](https://github.com/Eyescale/Equalizer/pull/463):
   Use program name as default window title
 * [463](https://github.com/Eyescale/Equalizer/pull/463):
diff --git a/eq/fabric/drawableConfig.h b/eq/fabric/drawableConfig.h
index e55d5a2626..2257044728 100644
--- a/eq/fabric/drawableConfig.h
+++ b/eq/fabric/drawableConfig.h
@@ -30,14 +30,15 @@ namespace fabric
     {
         DrawableConfig()
                 : stencilBits(0), colorBits(0), alphaBits(0), accumBits(0)
-                , glVersion( 0.f ), stereo( false ), doublebuffered( false )
-                , coreProfile( false ) {}
+                , glVersion( 0.f ), glewGLVersion( 0.f ), stereo( false )
+                , doublebuffered( false ) , coreProfile( false ) {}
 
         int32_t stencilBits;    //!< Number of stencil bits
         int32_t colorBits;      //!< Number of bits per color component
         int32_t alphaBits;      //!< Number of alpha bits
         int32_t accumBits;      //!< Number of accumulation bits
-        float   glVersion;      //!< OpenGL version
+        float   glVersion;      //!< OpenGL version (glGetString( GL_VERSION ))
+        float   glewGLVersion;  //!< OpenGL version (GLEW detected)
         bool    stereo;         //!< Active stereo supported
         bool    doublebuffered; //!< Doublebuffering supported
         bool    coreProfile;    //!< Core or Compat profile (since OpenGL 3.2)
@@ -46,7 +47,7 @@ namespace fabric
     inline std::ostream& operator << ( std::ostream& os,
                                        const DrawableConfig& config )
     {
-        os << "GL" << config.glVersion;
+        os << "GL" << config.glVersion << "|GLEW" << config.glewGLVersion;
         if( config.glVersion >= 3.2f )
             os << (config.coreProfile ? "|Core" : "|Compat");
         os << "|rgb" << config.colorBits;
@@ -77,4 +78,3 @@ template<> inline void byteswap( eq::fabric::DrawableConfig& value )
 }
 }
 #endif // EQ_DRAWABLECONFIG_H
-
diff --git a/eq/glWindow.cpp b/eq/glWindow.cpp
index 4c26e46b1a..a335abad7e 100644
--- a/eq/glWindow.cpp
+++ b/eq/glWindow.cpp
@@ -103,7 +103,7 @@ void GLWindow::initGLEW()
     if( _impl->glewInitialized )
         return;
 
-#ifndef _MSC_VER
+#ifdef __linux__
     // http://sourceforge.net/p/glew/patches/40/
     glewExperimental = true;
 #endif
@@ -254,6 +254,10 @@ void GLWindow::finish()
     glFinish();
 }
 
+#define TEST_GLEW_VERSION( MAJOR, MINOR ) \
+    if( GLEW_VERSION_ ## MAJOR ## _ ## MINOR )  \
+        drawableConfig.glewGLVersion = MAJOR ## . ## MINOR ## f;    \
+
 void GLWindow::queryDrawableConfig( DrawableConfig& drawableConfig )
 {
     // GL version
@@ -274,6 +278,26 @@ void GLWindow::queryDrawableConfig( DrawableConfig& drawableConfig )
         drawableConfig.coreProfile = mask & GL_CONTEXT_CORE_PROFILE_BIT;
     }
 
+    TEST_GLEW_VERSION( 1, 1 );
+    TEST_GLEW_VERSION( 1, 2 );
+    TEST_GLEW_VERSION( 1, 3 );
+    TEST_GLEW_VERSION( 1, 4 );
+    TEST_GLEW_VERSION( 1, 5 );
+    TEST_GLEW_VERSION( 2, 0 );
+    TEST_GLEW_VERSION( 2, 1 );
+    TEST_GLEW_VERSION( 3, 0 );
+    TEST_GLEW_VERSION( 3, 1 );
+    TEST_GLEW_VERSION( 3, 2 );
+    TEST_GLEW_VERSION( 3, 3 );
+    TEST_GLEW_VERSION( 4, 0 );
+    TEST_GLEW_VERSION( 4, 1 );
+    TEST_GLEW_VERSION( 4, 2 );
+    TEST_GLEW_VERSION( 4, 3 );
+#ifdef GLEW_VERSION_4_5
+    TEST_GLEW_VERSION( 4, 4 );
+    TEST_GLEW_VERSION( 4, 5 );
+#endif
+
     // Framebuffer capabilities
     GLboolean result;
     EQ_GL_CALL( glGetBooleanv( GL_STEREO, &result ));
diff --git a/examples/configs/4-window.all.eqc b/examples/configs/4-window.all.eqc
index c6ad2d9c94..b8580af864 100644
--- a/examples/configs/4-window.all.eqc
+++ b/examples/configs/4-window.all.eqc
@@ -149,6 +149,21 @@ server
             }
         }
         layout
+        {
+            name "DB_Active"
+            view
+            {
+                observer 0
+                viewport [ 0 .5 .5 .5 ]
+                wall
+                {
+                    bottom_left  [ -.5 -.5 -1 ]
+                    bottom_right [  .5 -.5 -1 ]
+                    top_left     [ -.5  .5 -1 ]
+                }
+            }
+        }
+        layout
         {
             name "Eye"
             view
@@ -316,6 +331,7 @@ server
             layout "DB_Stream"
             layout "DB_DirectSend"
             layout "DB_BinarySwap"
+            layout "DB_Active"
             layout "MultiLevel"
 
             layout "DFR"
@@ -872,6 +888,21 @@ server
             inputframe { name "frame.channel4" }
         }
 
+        compound
+        {
+            channel ( segment 0 layout "DB_Active" view 0 )
+            buffer [ COLOR DEPTH ]
+
+            load_equalizer{ mode DB }
+            compound {}
+            compound { channel "channel2" outputframe {} }
+            compound { channel "channel3" outputframe {} }
+            compound { channel "channel4" outputframe {} }
+            inputframe { name "frame.channel2" }
+            inputframe { name "frame.channel3" }
+            inputframe { name "frame.channel4" }
+        }
+
         # wall with cross-segment load-balancing
         compound
         {