XCode – XCode 4.2 beta ARC will not compile

I'm trying to build a simple OS X Command Line application in XCode 4.2 beta (Build 4D58). But I'm getting an error when I try to compile it saying:

/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSZone.h:57:22: error: 'CFMakeCollectable' is unavailable: not a开发者_开发知识库vailable in automatic reference counting mode [3] return (cf ? (id)CFMakeCollectable(cf) : nil);

And

/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:173:13: error: use of undeclared identifier '__bridge_retain' [3] return (__bridge_retain CFTypeRef)X;

I guess this has something to do with ARC but I'm not sure what to do have my application compile?

Xcode 4.2 beta is under NDA. You'd better to search "NSZone.h NSObject.h" for all periods in the developer forum. You will find the exact same question as yours.