Compile Errors

I've just upgraded to iTGB 1.4, iOS 4.0, iPhone SDK 4.0, XCode 3.2.3 and OSX 10.6.3. I have my targets set for Base SDK 4.0, GCC 4.0 and Deployment target as iPhone OS 3.2. I'm still getting compile errors and I can't see why. Anybody else see this? Have a solution? Missing something? Any help would be very appreciated.

SOLUTION:
Use GCC 4.2 instead of GCC 4.0
Add #include <unistd.h> to iPhoneTime.mm

/Developer/Headers/FlatCarbon/MacTypes.h:1:39: error: CoreServices/CoreServices.h: No such file or directory
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.0.sdk/System/Library/Frameworks/CFNetwork.framework/Headers/CFHost.h:182: error: 'CFHostClientCallBack' has not been declared
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.0.sdk/System/Library/Frameworks/CFNetwork.framework/Headers/CFHost.h:182: error: 'CALLBACK_API_C' declared as function returning a function
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.0.sdk/System/Library/Frameworks/CFNetwork.framework/Headers/CFHost.h:182: error: '<anonymous>' has incomplete type
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.0.sdk/System/Library/Frameworks/CFNetwork.framework/Headers/CFHost.h:182: error: invalid use of 'void'
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.0.sdk/System/Library/Frameworks/CFNetwork.framework/Headers/CFHost.h:182: confused by earlier errors, bailing out