diff --git a/distrib/scripts/mac/macbuild-lipo b/distrib/scripts/mac/macbuild-lipo
index 1a45eb57b5..cd4f437d21 100755
--- a/distrib/scripts/mac/macbuild-lipo
+++ b/distrib/scripts/mac/macbuild-lipo
@@ -16,8 +16,8 @@ do_lipo_build(){
     DIR="bld-$1"
     
     if [ "$1" = "ppc" ]; then
-        export CXX="g++-3.3 -arch ppc -DMAC_OS_X_VERSION_MAX_ALLOWED=1030"
-        export CC="gcc-3.3 -arch ppc -DMAC_OS_X_VERSION_MAX_ALLOWED=1030"
+        export CXX="g++-3.3 -arch ppc -DMAC_OS_X_VERSION_MAX_ALLOWED=1040"
+        export CC="gcc-3.3 -arch ppc -DMAC_OS_X_VERSION_MAX_ALLOWED=1040"
         export MACOSX_DEPLOYMENT_TARGET=10.3
     else
         export CXX="g++-4.0 -arch i386"
diff --git a/src/mac/carbon/dccg.cpp b/src/mac/carbon/dccg.cpp
index eed1bb4f8b..30e3ea99e3 100755
--- a/src/mac/carbon/dccg.cpp
+++ b/src/mac/carbon/dccg.cpp
@@ -35,14 +35,18 @@
 #include "wx/mac/private.h"
 
 
-#ifndef wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
-#define wxMAC_USE_CORE_GRAPHICS_BLEND_MODES 0
-#endif
-
 #if MAC_OS_X_VERSION_MAX_ALLOWED <= MAC_OS_X_VERSION_10_4
 typedef float CGFloat ;
 #endif
 
+#ifndef wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4
+    #define wxMAC_USE_CORE_GRAPHICS_BLEND_MODES 1
+#else
+    #define wxMAC_USE_CORE_GRAPHICS_BLEND_MODES 0
+#endif
+#endif
+
 //-----------------------------------------------------------------------------
 // constants
 //-----------------------------------------------------------------------------
@@ -1561,13 +1565,16 @@ void wxDC::SetLogicalFunction( int function )
 
     m_logicalFunction = function ;
 #if wxMAC_USE_CORE_GRAPHICS_BLEND_MODES
-    CGContextRef cgContext = ((wxMacCGContext*)(m_graphicContext))->GetNativeContext() ;
-    if ( m_logicalFunction == wxCOPY )
-        CGContextSetBlendMode( cgContext, kCGBlendModeNormal ) ;
-    else if ( m_logicalFunction == wxINVERT )
-        CGContextSetBlendMode( cgContext, kCGBlendModeExclusion ) ;
-    else
-        CGContextSetBlendMode( cgContext, kCGBlendModeNormal ) ;
+    if ( CGContextSetBlendMode != 0 )
+    {
+        CGContextRef cgContext = ((wxMacCGContext*)(m_graphicContext))->GetNativeContext() ;
+        if ( m_logicalFunction == wxCOPY )
+            CGContextSetBlendMode( cgContext, kCGBlendModeNormal ) ;
+        else if ( m_logicalFunction == wxINVERT || m_logicalFunction == wxXOR )
+            CGContextSetBlendMode( cgContext, kCGBlendModeExclusion ) ;
+        else
+            CGContextSetBlendMode( cgContext, kCGBlendModeNormal ) ;
+    }
 #endif
 }