GHUnit CLI Build: Availability.h errors

I am trying to do a command line build of a GHUnit target which builds fine inside Xcode. I am running the following command to build:

GHUNIT_CLI=1 xcodebuild -target BasicBrowserUnitTest -configuration Debug -sdk iphonesim开发者_运维知识库ulator4.0 build

It gets along pretty nice, until it finds an error in Availability.h, an SDK header:

/Xcode4 GM/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.0.sdk/usr/include/AvailabilityInternal.h:56:42: error: operator '<' has no left operand

Obviously, I haven't made any changes to Apple's stuff, why am I getting this error and how do I fix it?

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The problem is that I wasn't specifying the correct SDK version:

GHUNIT_CLI=1 xcodebuild -target BasicBrowserUnitTest -configuration Debug -sdk iphonesimulator4.0 build

Needed to be:

GHUNIT_CLI=1 xcodebuild -target BasicBrowserUnitTest -configuration Debug -sdk iphonesimulator4.3 build

Or in this case, the latest SDK version.