--- src/gui/painting/qpaintengine_mac.cpp.orig
+++ src/gui/painting/qpaintengine_mac.cpp
@@ -334,7 +334,16 @@
     if ((colorSpace = m_displayColorSpaceHash.value(displayID)))
         return colorSpace;
 
+#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)
     colorSpace = CGDisplayCopyColorSpace(displayID);
+#else
+    CMProfileRef displayProfile = 0;
+    CMError err = CMGetProfileByAVID((CMDisplayIDType)displayID, &displayProfile);
+    if (err == noErr) {
+        colorSpace = CGColorSpaceCreateWithPlatformColorSpace(displayProfile);
+        CMCloseProfile(displayProfile);
+    }
+#endif
     if (colorSpace == 0)
         colorSpace = CGColorSpaceCreateDeviceRGB();