diff --git a/CMakeLists.txt b/CMakeLists.txt
index a4c2a4227c075b51282a39a0c9b1a6c31aa9ff26..bb9ecc60a47797f8e6c511a9ebd16be0c8965a33 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -266,8 +266,8 @@ if(APPLE)
     )
 
   if (CMAKE_OSX_DEPLOYMENT_TARGET AND
-      CMAKE_OSX_DEPLOYMENT_TARGET VERSION_LESS 10.6)
-    message(FATAL_ERROR "Minimun OS X deployment target is 10.6, please update CMAKE_OSX_DEPLOYMENT_TARGET.")
+      CMAKE_OSX_DEPLOYMENT_TARGET VERSION_LESS 10.7)
+    message(FATAL_ERROR "Minimun OS X deployment target is 10.7, please update CMAKE_OSX_DEPLOYMENT_TARGET.")
   endif ()
 endif()
 
diff --git a/README.md b/README.md
index ebdfe14df1b20443e365f25cd6890a4faba18cb3..e57564636d78e10a8365b8de8322be1d598974fe 100644
--- a/README.md
+++ b/README.md
@@ -71,7 +71,7 @@ VTK supports the following compilers:
 
 VTK supports the following operating systems:
 1. Windows Vista or newer
-2. Mac OS X 10.6.8 or newer
+2. Mac OS X 10.7 or newer
 3. Linux (ex: Ubuntu 12.04 or newer, Debian 4 or newer)
 
 Contributing
diff --git a/Rendering/LIC/vtkLineIntegralConvolution2D.cxx b/Rendering/LIC/vtkLineIntegralConvolution2D.cxx
index 85639b738b4a539ccb9ea0205ac6ff229130fcec..a1e91a9d87e863317c3b9fb17102e09b04811b4e 100644
--- a/Rendering/LIC/vtkLineIntegralConvolution2D.cxx
+++ b/Rendering/LIC/vtkLineIntegralConvolution2D.cxx
@@ -1050,17 +1050,8 @@ bool vtkLineIntegralConvolution2D::IsSupported(vtkRenderWindow *renWin)
     return false;
   }
 
-#if defined(__APPLE__) || defined(_WIN32)
-  vtkOpenGLExtensionManager *manager = context->GetExtensionManager();
-#endif
-#if defined(__APPLE__)
-  if (manager->DriverIsNvidia() && manager->DriverVersionIs(1,6))
-  {
-    // Mac OS X 10.6 GLSL doesn't support array initializer
-    return false;
-  }
-#endif
 #if defined(_WIN32)
+  vtkOpenGLExtensionManager *manager = context->GetExtensionManager();
   if ( manager->DriverIsIntel() && manager->DriverGLRendererHas("HD Graphics")
     && !manager->GetIgnoreDriverBugs("Intel HD 2k,3k,4k incorrect results") )
   {
diff --git a/Rendering/OpenGL/vtkCocoaGLView.mm b/Rendering/OpenGL/vtkCocoaGLView.mm
index 73763423cf6b4684f04e9725ff40b11db3eb4696..2601ab229d1fbe49c874a5aff221274a38936a14 100644
--- a/Rendering/OpenGL/vtkCocoaGLView.mm
+++ b/Rendering/OpenGL/vtkCocoaGLView.mm
@@ -202,11 +202,7 @@ static const char *vtkMacKeyCodeToKeySymTable[128] = {
   // first responder.
   NSPoint windowLoc = [[self window] mouseLocationOutsideOfEventStream];
   NSPoint viewLoc = [self convertPoint:windowLoc fromView:nil];
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
   NSPoint backingLoc = [self convertPointToBacking:viewLoc];
-#else
-  NSPoint backingLoc = viewLoc;
-#endif
 
   NSUInteger flags = [theEvent modifierFlags];
   int shiftDown = ((flags & NSEventModifierFlagShift) != 0);
@@ -306,11 +302,7 @@ static const char *vtkMacKeyCodeToKeySymTable[128] = {
   // left corner. Since this is a mouse event, we can use locationInWindow.
   NSPoint windowLoc = [theEvent locationInWindow];
   NSPoint viewLoc = [self convertPoint:windowLoc fromView:nil];
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
   NSPoint backingLoc = [self convertPointToBacking:viewLoc];
-#else
-  NSPoint backingLoc = viewLoc;
-#endif
 
   NSUInteger flags = [theEvent modifierFlags];
   int shiftDown = ((flags & NSEventModifierFlagShift) != 0);
@@ -342,11 +334,7 @@ static const char *vtkMacKeyCodeToKeySymTable[128] = {
   // left corner. Since this is a mouse event, we can use locationInWindow.
   NSPoint windowLoc = [theEvent locationInWindow];
   NSPoint viewLoc = [self convertPoint:windowLoc fromView:nil];
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
   NSPoint backingLoc = [self convertPointToBacking:viewLoc];
-#else
-  NSPoint backingLoc = viewLoc;
-#endif
 
   int clickCount = static_cast<int>([theEvent clickCount]);
   int repeatCount = ((clickCount > 1) ? clickCount - 1 : 0);
diff --git a/Rendering/OpenGL/vtkCocoaMacOSXSDKCompatibility.h b/Rendering/OpenGL/vtkCocoaMacOSXSDKCompatibility.h
index caca0ff5e32fb1cf2402de6529d498e0e1d31b64..67ce655d906a314412106e741798b256edf0d09b 100644
--- a/Rendering/OpenGL/vtkCocoaMacOSXSDKCompatibility.h
+++ b/Rendering/OpenGL/vtkCocoaMacOSXSDKCompatibility.h
@@ -16,7 +16,7 @@ PURPOSE.  See the above copyright notice for more information.
  * @class   vtkCocoaMacOSXSDKCompatibility
  * @brief   Compatibility header
  *
- * VTK requires the Mac OS X 10.6 SDK or later.
+ * VTK requires the Mac OS X 10.7 SDK or later.
  * However, this file is meant to allow us to use features from newer
  * SDKs by adding workarounds to still support the minimum SDK.
  * It is safe to include this header multiple times.
@@ -24,17 +24,12 @@ PURPOSE.  See the above copyright notice for more information.
 
 #include <AvailabilityMacros.h>
 
-#if MAC_OS_X_VERSION_MAX_ALLOWED < 1060
-  #error VTK requires the Mac OS X 10.6 SDK or later
+#if MAC_OS_X_VERSION_MAX_ALLOWED < 1070
+  #error VTK requires the Mac OS X 10.7 SDK or later
 #endif
 
-#if MAC_OS_X_VERSION_MIN_REQUIRED < 1068
-  #error VTK requires a deployment target of Mac OS X 10.6.8 or later
-#endif
-
-// __has_feature is new in the 10.7 SDK, define it here if it's not yet defined.
-#ifndef __has_feature
-  #define __has_feature(x) 0
+#if MAC_OS_X_VERSION_MIN_REQUIRED < 1070
+  #error VTK requires a deployment target of Mac OS X 10.7 or later
 #endif
 
 #if (MAC_OS_X_VERSION_MAX_ALLOWED < 101200) && !defined(VTK_DONT_MAP_10_12_ENUMS)
diff --git a/Rendering/OpenGL/vtkCocoaRenderWindow.h b/Rendering/OpenGL/vtkCocoaRenderWindow.h
index ef21bf6ec8e29757686a3b46ec18f3dc4e5f3e51..49f8487d668706d7082e8962a13139e0e20f6e9e 100644
--- a/Rendering/OpenGL/vtkCocoaRenderWindow.h
+++ b/Rendering/OpenGL/vtkCocoaRenderWindow.h
@@ -18,8 +18,7 @@ PURPOSE.  See the above copyright notice for more information.
  *
  *
  * vtkCocoaRenderWindow is a concrete implementation of the abstract
- * class vtkOpenGLRenderWindow. It is only available on Mac OS X 10.6
- * and later.
+ * class vtkOpenGLRenderWindow. It is only available on Mac OS X.
  * To use this class, build VTK with VTK_USE_COCOA turned ON (this is
  * the default).
  * This class can be used by 32 and 64 bit processes, and either in
diff --git a/Rendering/OpenGL/vtkCocoaRenderWindow.mm b/Rendering/OpenGL/vtkCocoaRenderWindow.mm
index d986e6d5112d560c55b58bda12f7bd2ccabdb998..d0cb78ff0d8446b0ea7f387392b42ffe3bc5b8e7 100644
--- a/Rendering/OpenGL/vtkCocoaRenderWindow.mm
+++ b/Rendering/OpenGL/vtkCocoaRenderWindow.mm
@@ -181,11 +181,7 @@ vtkStandardNewMacro(vtkCocoaRenderWindow);
   NSRect viewRect = [view frame];
 
   // Convert from points to pixels.
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
   NSRect backingViewRect = [view convertRectToBacking:viewRect];
-#else
-  NSRect backingViewRect = viewRect;
-#endif
 
   int newWidth = static_cast<int>(NSWidth(backingViewRect));
   int newHeight = static_cast<int>(NSHeight(backingViewRect));
@@ -546,11 +542,7 @@ void vtkCocoaRenderWindow::SetSize(int x, int y)
 
         // Convert the given new size from pixels to points.
         NSSize backingNewSize = NSMakeSize((CGFloat)x, (CGFloat)y);
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
         NSSize newSize = [theView convertSizeFromBacking:backingNewSize];
-#else
-        NSSize newSize = backingNewSize;
-#endif
 
         // Update the view's frame (in points) keeping the bottom-left
         // corner in the same place.
@@ -574,11 +566,7 @@ void vtkCocoaRenderWindow::SetSize(int x, int y)
 
         // Convert the given new size from pixels to points.
         NSRect backingNewRect = NSMakeRect(0.0, 0.0, (CGFloat)x, (CGFloat)y);
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
         NSRect newRect = [window convertRectFromBacking:backingNewRect];
-#else
-        NSRect newRect = backingNewRect;
-#endif
         [window setContentSize:newRect.size];
 
         resizing = false;
@@ -626,11 +614,7 @@ void vtkCocoaRenderWindow::SetPosition(int x, int y)
 
         // Convert the given new position from pixels to points.
         NSPoint backingNewPosition = NSMakePoint((CGFloat)x, (CGFloat)y);
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
         NSPoint newPosition = [theView convertPointFromBacking:backingNewPosition];
-#else
-        NSPoint newPosition = backingNewPosition;
-#endif
 
         // Update the view's frameOrigin (in points) keeping the bottom-left
         // corner in the same place.
@@ -655,11 +639,7 @@ void vtkCocoaRenderWindow::SetPosition(int x, int y)
 
         // Convert the given new position from pixels to points.
         NSRect backingNewPosition = NSMakeRect(0.0, 0.0, (CGFloat)x, (CGFloat)y);
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
         NSRect newPosition = [window convertRectFromBacking:backingNewPosition];
-#else
-        NSRect newPosition = backingNewPosition;
-#endif
 
         [window setFrameOrigin:newPosition.origin];
 
@@ -804,11 +784,7 @@ void vtkCocoaRenderWindow::CreateAWindow()
     NSRect screenRect = [screen frame];
 
     // Convert from points to pixels.
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
     NSRect backingScreenRect = [screen convertRectToBacking:screenRect];
-#else
-    NSRect backingScreenRect = screenRect;
-#endif
 
     if (this->FullScreen && screen)
     {
@@ -847,7 +823,6 @@ void vtkCocoaRenderWindow::CreateAWindow()
 
       // Convert from pixels to points.
       NSRect contentRect;
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
       if (screen)
       {
         contentRect = [screen convertRectFromBacking:backingContentRect];
@@ -856,9 +831,6 @@ void vtkCocoaRenderWindow::CreateAWindow()
       {
         contentRect = backingContentRect;
       }
-#else
-      contentRect = backingContentRect;
-#endif
 
       theWindow = [[NSWindow alloc]
                    initWithContentRect:contentRect
@@ -906,11 +878,7 @@ void vtkCocoaRenderWindow::CreateAWindow()
                                           (CGFloat)this->Position[1],
                                           (CGFloat)this->Size[0],
                                           (CGFloat)this->Size[1]);
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
       NSRect viewRect = [window convertRectFromBacking:backingViewRect];
-#else
-      NSRect viewRect = backingViewRect;
-#endif
 
       CGFloat width = NSWidth(viewRect);
       CGFloat height = NSHeight(viewRect);
@@ -946,11 +914,7 @@ void vtkCocoaRenderWindow::CreateAWindow()
       // Convert from points to pixels.
       NSWindow *window = (NSWindow*)this->GetRootWindow();
       assert(window);
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
       NSRect viewRect = [window convertRectFromBacking:backingViewRect];
-#else
-      NSRect viewRect = backingViewRect;
-#endif
 
       // Create a vtkCocoaGLView.
       vtkCocoaGLView *glView = [[vtkCocoaGLView alloc] initWithFrame:viewRect];
@@ -1172,11 +1136,7 @@ int *vtkCocoaRenderWindow::GetSize()
     NSRect viewRect = [view frame];
 
     // Convert from points to pixels.
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
     NSRect backingViewRect = [view convertRectToBacking:viewRect];
-#else
-    NSRect backingViewRect = viewRect;
-#endif
 
     this->Size[0] = static_cast<int>(NSWidth(backingViewRect));
     this->Size[1] = static_cast<int>(NSHeight(backingViewRect));
@@ -1197,11 +1157,7 @@ int *vtkCocoaRenderWindow::GetScreenSize()
   NSRect screenRect = [screen frame];
 
   // Convert from points to pixels.
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
   NSRect backingScreenRect = [screen convertRectToBacking:screenRect];
-#else
-  NSRect backingScreenRect = screenRect;
-#endif
 
   this->Size[0] = static_cast<int>(NSWidth(backingScreenRect));
   this->Size[1] = static_cast<int>(NSHeight(backingScreenRect));
@@ -1228,13 +1184,8 @@ int *vtkCocoaRenderWindow::GetPosition()
     NSRect viewRect = [view frame];
 
     // Convert from points to pixels.
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
     NSRect backingParentRect = [parent convertRectToBacking:parentRect];
     NSRect backingViewRect = [view convertRectToBacking:viewRect];
-#else
-    NSRect backingParentRect = parentRect;
-    NSRect backingViewRect = viewRect;
-#endif
 
     this->Position[0] = static_cast<int>(NSMinX(backingViewRect));
     this->Position[1] = static_cast<int>(NSHeight(backingParentRect)
@@ -1254,11 +1205,7 @@ int *vtkCocoaRenderWindow::GetPosition()
       NSRect windowRect = [window frame];
 
       // Convert from points to pixels.
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
       NSRect backingWindowRect = [window convertRectToBacking:windowRect];
-#else
-      NSRect backingWindowRect = windowRect;
-#endif
 
       this->Position[0] = static_cast<int>(NSMinX(backingWindowRect));
       this->Position[1] = static_cast<int>(NSMinY(backingWindowRect));
diff --git a/Rendering/OpenGL/vtkCoreGraphicsGPUInfoList.cxx b/Rendering/OpenGL/vtkCoreGraphicsGPUInfoList.cxx
index 826988ab9716615c455e653cb651b00132eb6eae..251b4bf7ff9a3de5e869b4b403fd584f1cae8560 100644
--- a/Rendering/OpenGL/vtkCoreGraphicsGPUInfoList.cxx
+++ b/Rendering/OpenGL/vtkCoreGraphicsGPUInfoList.cxx
@@ -49,13 +49,8 @@ void vtkCoreGraphicsGPUInfoList::Probe()
       {
         GLint vramGL = 0;
         vtkTypeUInt64 vramVTK = 0;
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
         error = CGLDescribeRenderer(infoObj, i, kCGLRPVideoMemoryMegabytes, &vramGL);
         vramVTK = static_cast<vtkTypeUInt64>(vramGL) * 1024 * 1024;
-#else
-        error = CGLDescribeRenderer(infoObj, i, kCGLRPVideoMemory, &vramGL);
-        vramVTK = static_cast<vtkTypeUInt64>(vramGL);
-#endif
 
         // The software renderer will return a video memory of 0, so ignore it.
         if ((error == kCGLNoError) && (vramVTK > 0))
diff --git a/Rendering/OpenGL2/vtkCocoaGLView.mm b/Rendering/OpenGL2/vtkCocoaGLView.mm
index 73763423cf6b4684f04e9725ff40b11db3eb4696..2601ab229d1fbe49c874a5aff221274a38936a14 100644
--- a/Rendering/OpenGL2/vtkCocoaGLView.mm
+++ b/Rendering/OpenGL2/vtkCocoaGLView.mm
@@ -202,11 +202,7 @@ static const char *vtkMacKeyCodeToKeySymTable[128] = {
   // first responder.
   NSPoint windowLoc = [[self window] mouseLocationOutsideOfEventStream];
   NSPoint viewLoc = [self convertPoint:windowLoc fromView:nil];
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
   NSPoint backingLoc = [self convertPointToBacking:viewLoc];
-#else
-  NSPoint backingLoc = viewLoc;
-#endif
 
   NSUInteger flags = [theEvent modifierFlags];
   int shiftDown = ((flags & NSEventModifierFlagShift) != 0);
@@ -306,11 +302,7 @@ static const char *vtkMacKeyCodeToKeySymTable[128] = {
   // left corner. Since this is a mouse event, we can use locationInWindow.
   NSPoint windowLoc = [theEvent locationInWindow];
   NSPoint viewLoc = [self convertPoint:windowLoc fromView:nil];
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
   NSPoint backingLoc = [self convertPointToBacking:viewLoc];
-#else
-  NSPoint backingLoc = viewLoc;
-#endif
 
   NSUInteger flags = [theEvent modifierFlags];
   int shiftDown = ((flags & NSEventModifierFlagShift) != 0);
@@ -342,11 +334,7 @@ static const char *vtkMacKeyCodeToKeySymTable[128] = {
   // left corner. Since this is a mouse event, we can use locationInWindow.
   NSPoint windowLoc = [theEvent locationInWindow];
   NSPoint viewLoc = [self convertPoint:windowLoc fromView:nil];
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
   NSPoint backingLoc = [self convertPointToBacking:viewLoc];
-#else
-  NSPoint backingLoc = viewLoc;
-#endif
 
   int clickCount = static_cast<int>([theEvent clickCount]);
   int repeatCount = ((clickCount > 1) ? clickCount - 1 : 0);
diff --git a/Rendering/OpenGL2/vtkCocoaMacOSXSDKCompatibility.h b/Rendering/OpenGL2/vtkCocoaMacOSXSDKCompatibility.h
index caca0ff5e32fb1cf2402de6529d498e0e1d31b64..67ce655d906a314412106e741798b256edf0d09b 100644
--- a/Rendering/OpenGL2/vtkCocoaMacOSXSDKCompatibility.h
+++ b/Rendering/OpenGL2/vtkCocoaMacOSXSDKCompatibility.h
@@ -16,7 +16,7 @@ PURPOSE.  See the above copyright notice for more information.
  * @class   vtkCocoaMacOSXSDKCompatibility
  * @brief   Compatibility header
  *
- * VTK requires the Mac OS X 10.6 SDK or later.
+ * VTK requires the Mac OS X 10.7 SDK or later.
  * However, this file is meant to allow us to use features from newer
  * SDKs by adding workarounds to still support the minimum SDK.
  * It is safe to include this header multiple times.
@@ -24,17 +24,12 @@ PURPOSE.  See the above copyright notice for more information.
 
 #include <AvailabilityMacros.h>
 
-#if MAC_OS_X_VERSION_MAX_ALLOWED < 1060
-  #error VTK requires the Mac OS X 10.6 SDK or later
+#if MAC_OS_X_VERSION_MAX_ALLOWED < 1070
+  #error VTK requires the Mac OS X 10.7 SDK or later
 #endif
 
-#if MAC_OS_X_VERSION_MIN_REQUIRED < 1068
-  #error VTK requires a deployment target of Mac OS X 10.6.8 or later
-#endif
-
-// __has_feature is new in the 10.7 SDK, define it here if it's not yet defined.
-#ifndef __has_feature
-  #define __has_feature(x) 0
+#if MAC_OS_X_VERSION_MIN_REQUIRED < 1070
+  #error VTK requires a deployment target of Mac OS X 10.7 or later
 #endif
 
 #if (MAC_OS_X_VERSION_MAX_ALLOWED < 101200) && !defined(VTK_DONT_MAP_10_12_ENUMS)
diff --git a/Rendering/OpenGL2/vtkCocoaRenderWindow.h b/Rendering/OpenGL2/vtkCocoaRenderWindow.h
index 42e3a0546b4d5cbbf95dc0fc8ae2c7a0c34bbbe9..53d4150ddeec5629d245d1bc8e13b2fa505c0b06 100644
--- a/Rendering/OpenGL2/vtkCocoaRenderWindow.h
+++ b/Rendering/OpenGL2/vtkCocoaRenderWindow.h
@@ -18,8 +18,7 @@ PURPOSE.  See the above copyright notice for more information.
  *
  *
  * vtkCocoaRenderWindow is a concrete implementation of the abstract
- * class vtkOpenGLRenderWindow. It is only available on Mac OS X 10.6
- * and later.
+ * class vtkOpenGLRenderWindow. It is only available on Mac OS X.
  * To use this class, build VTK with VTK_USE_COCOA turned ON (this is
  * the default).
  * This class can be used by 32 and 64 bit processes, and either in
diff --git a/Rendering/OpenGL2/vtkCocoaRenderWindow.mm b/Rendering/OpenGL2/vtkCocoaRenderWindow.mm
index 0bfb57450aba88cbcbed08d362e4069ab5cdf537..ec03f17ba2b100c2b323b1c9235587bd9d6b44e4 100644
--- a/Rendering/OpenGL2/vtkCocoaRenderWindow.mm
+++ b/Rendering/OpenGL2/vtkCocoaRenderWindow.mm
@@ -185,11 +185,7 @@ vtkStandardNewMacro(vtkCocoaRenderWindow);
   NSRect viewRect = [view frame];
 
   // Convert from points to pixels.
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
   NSRect backingViewRect = [view convertRectToBacking:viewRect];
-#else
-  NSRect backingViewRect = viewRect;
-#endif
 
   int newWidth = static_cast<int>(NSWidth(backingViewRect));
   int newHeight = static_cast<int>(NSHeight(backingViewRect));
@@ -536,11 +532,7 @@ void vtkCocoaRenderWindow::SetSize(int x, int y)
 
         // Convert the given new size from pixels to points.
         NSSize backingNewSize = NSMakeSize((CGFloat)x, (CGFloat)y);
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
         NSSize newSize = [theView convertSizeFromBacking:backingNewSize];
-#else
-        NSSize newSize = backingNewSize;
-#endif
 
         // Update the view's frame (in points) keeping the bottom-left
         // corner in the same place.
@@ -564,11 +556,7 @@ void vtkCocoaRenderWindow::SetSize(int x, int y)
 
         // Convert the given new size from pixels to points.
         NSRect backingNewRect = NSMakeRect(0.0, 0.0, (CGFloat)x, (CGFloat)y);
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
         NSRect newRect = [window convertRectFromBacking:backingNewRect];
-#else
-        NSRect newRect = backingNewRect;
-#endif
         [window setContentSize:newRect.size];
 
         resizing = false;
@@ -616,11 +604,7 @@ void vtkCocoaRenderWindow::SetPosition(int x, int y)
 
         // Convert the given new position from pixels to points.
         NSPoint backingNewPosition = NSMakePoint((CGFloat)x, (CGFloat)y);
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
         NSPoint newPosition = [theView convertPointFromBacking:backingNewPosition];
-#else
-        NSPoint newPosition = backingNewPosition;
-#endif
 
         // Update the view's frameOrigin (in points) keeping the bottom-left
         // corner in the same place.
@@ -645,11 +629,7 @@ void vtkCocoaRenderWindow::SetPosition(int x, int y)
 
         // Convert the given new position from pixels to points.
         NSRect backingNewPosition = NSMakeRect(0.0, 0.0, (CGFloat)x, (CGFloat)y);
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
         NSRect newPosition = [window convertRectFromBacking:backingNewPosition];
-#else
-        NSRect newPosition = backingNewPosition;
-#endif
 
         [window setFrameOrigin:newPosition.origin];
 
@@ -791,11 +771,7 @@ void vtkCocoaRenderWindow::CreateAWindow()
     NSRect screenRect = [screen frame];
 
     // Convert from points to pixels.
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
     NSRect backingScreenRect = [screen convertRectToBacking:screenRect];
-#else
-    NSRect backingScreenRect = screenRect;
-#endif
 
     if (this->FullScreen && screen)
     {
@@ -834,7 +810,6 @@ void vtkCocoaRenderWindow::CreateAWindow()
 
       // Convert from pixels to points.
       NSRect contentRect;
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
       if (screen)
       {
         contentRect = [screen convertRectFromBacking:backingContentRect];
@@ -843,9 +818,6 @@ void vtkCocoaRenderWindow::CreateAWindow()
       {
         contentRect = backingContentRect;
       }
-#else
-      contentRect = backingContentRect;
-#endif
 
       theWindow = [[NSWindow alloc]
                    initWithContentRect:contentRect
@@ -893,11 +865,7 @@ void vtkCocoaRenderWindow::CreateAWindow()
                                           (CGFloat)this->Position[1],
                                           (CGFloat)this->Size[0],
                                           (CGFloat)this->Size[1]);
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
       NSRect viewRect = [window convertRectFromBacking:backingViewRect];
-#else
-      NSRect viewRect = backingViewRect;
-#endif
 
       CGFloat width = NSWidth(viewRect);
       CGFloat height = NSHeight(viewRect);
@@ -933,11 +901,7 @@ void vtkCocoaRenderWindow::CreateAWindow()
       // Convert from points to pixels.
       NSWindow *window = (NSWindow*)this->GetRootWindow();
       assert(window);
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
       NSRect viewRect = [window convertRectFromBacking:backingViewRect];
-#else
-      NSRect viewRect = backingViewRect;
-#endif
 
       // Create a vtkCocoaGLView.
       vtkCocoaGLView *glView = [[vtkCocoaGLView alloc] initWithFrame:viewRect];
@@ -1003,10 +967,9 @@ void vtkCocoaRenderWindow::CreateGLContext()
     int i = 0;
     NSOpenGLPixelFormatAttribute attribs[20];
 
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
     attribs[i++] = NSOpenGLPFAOpenGLProfile;
     attribs[i++] = NSOpenGLProfileVersion3_2Core;
-#endif
+
   //  OS X always prefers an accelerated context
   //    attribs[i++] = NSOpenGLPFAAccelerated;
     attribs[i++] = NSOpenGLPFADepthSize;
@@ -1058,11 +1021,7 @@ void vtkCocoaRenderWindow::CreateGLContext()
     }
     else
     {
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
       this->SetContextSupportsOpenGL32(true);
-#else
-      this->SetContextSupportsOpenGL32(false);
-#endif
     }
   }
 
@@ -1172,11 +1131,7 @@ int *vtkCocoaRenderWindow::GetSize()
     NSRect viewRect = [view frame];
 
     // Convert from points to pixels.
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
     NSRect backingViewRect = [view convertRectToBacking:viewRect];
-#else
-    NSRect backingViewRect = viewRect;
-#endif
 
     this->Size[0] = static_cast<int>(NSWidth(backingViewRect));
     this->Size[1] = static_cast<int>(NSHeight(backingViewRect));
@@ -1197,11 +1152,7 @@ int *vtkCocoaRenderWindow::GetScreenSize()
   NSRect screenRect = [screen frame];
 
   // Convert from points to pixels.
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
   NSRect backingScreenRect = [screen convertRectToBacking:screenRect];
-#else
-  NSRect backingScreenRect = screenRect;
-#endif
 
   this->Size[0] = static_cast<int>(NSWidth(backingScreenRect));
   this->Size[1] = static_cast<int>(NSHeight(backingScreenRect));
@@ -1228,13 +1179,8 @@ int *vtkCocoaRenderWindow::GetPosition()
     NSRect viewRect = [view frame];
 
     // Convert from points to pixels.
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
     NSRect backingParentRect = [parent convertRectToBacking:parentRect];
     NSRect backingViewRect = [view convertRectToBacking:viewRect];
-#else
-    NSRect backingParentRect = parentRect;
-    NSRect backingViewRect = viewRect;
-#endif
 
     this->Position[0] = static_cast<int>(NSMinX(backingViewRect));
     this->Position[1] = static_cast<int>(NSHeight(backingParentRect)
@@ -1254,11 +1200,7 @@ int *vtkCocoaRenderWindow::GetPosition()
       NSRect windowRect = [window frame];
 
       // Convert from points to pixels.
-#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1070
       NSRect backingWindowRect = [window convertRectToBacking:windowRect];
-#else
-      NSRect backingWindowRect = windowRect;
-#endif
 
       this->Position[0] = static_cast<int>(NSMinX(backingWindowRect));
       this->Position[1] = static_cast<int>(NSMinY(backingWindowRect));
diff --git a/Rendering/OpenGL2/vtkIOSRenderWindow.h b/Rendering/OpenGL2/vtkIOSRenderWindow.h
index c79550ddc97f07ff0df82a0489af4cfd7287b312..be5168174a1b2378123086f1155709db32b81f07 100644
--- a/Rendering/OpenGL2/vtkIOSRenderWindow.h
+++ b/Rendering/OpenGL2/vtkIOSRenderWindow.h
@@ -18,8 +18,7 @@ PURPOSE.  See the above copyright notice for more information.
  *
  *
  * vtkIOSRenderWindow is a concrete implementation of the abstract
- * class vtkOpenGLRenderWindow. It is only available on Mac OS X 10.6
- * and later.
+ * class vtkOpenGLRenderWindow. It is only available on iOS.
  * To use this class, build VTK with VTK_USE_IOS turned ON (this is
  * the default).
  * This class can be used by 32 and 64 bit processes, and either in
diff --git a/Rendering/VolumeOpenGL/vtkOpenGLGPUVolumeRayCastMapper.cxx b/Rendering/VolumeOpenGL/vtkOpenGLGPUVolumeRayCastMapper.cxx
index 8cb30f5f87bf19427bfce7d0eea52d65a2d29501..81c8b81e1c0de70deafe0478b7a6950ed63bc33a 100644
--- a/Rendering/VolumeOpenGL/vtkOpenGLGPUVolumeRayCastMapper.cxx
+++ b/Rendering/VolumeOpenGL/vtkOpenGLGPUVolumeRayCastMapper.cxx
@@ -2192,27 +2192,6 @@ void vtkOpenGLGPUVolumeRayCastMapper::LoadExtensions(
   }
   vtkOpenGLExtensionManager *extensions = context->GetExtensionManager();
 
-  // It does not work on Mac OS X 10.6 (Snow Leopard) with nVidia.
-  // There is a bug in that OpenGL driver with an error in the
-  // Cg compiler about an infinite loop.
-  // However it works with Mac OS X 10.7 (Lion) with nVidia.
-#if defined(__APPLE__) && (MAC_OS_X_VERSION_MIN_REQUIRED < 1070)
-  // Gestalt() is deprecated, but all this code will go away when 10.7 is VTK's minimum.
-  #pragma clang diagnostic push
-  #pragma clang diagnostic ignored "-Wdeprecated-declarations"
-  SInt32 major, minor;
-  Gestalt (gestaltSystemVersionMajor, &major);
-  Gestalt (gestaltSystemVersionMinor, &minor);
-  #pragma clang diagnostic pop
-  if (extensions->DriverIsNvidia() && (major == 10) && (minor == 6))
-  {
-    this->UnsupportedRequiredExtensions->Stream <<
-      " Disabled on unsupported Apple OS X driver.";
-    this->LoadExtensionsSucceeded=0;
-    return;
-  }
-#endif
-
   // mesa notes:
   // 8.0.0 -- missing some required extensions
   // 8.0.5 -- tests pass but there are invalid enum opengl errors reported (mesa bug)