qmake creates XCode project file not compatible with XCode 4 - crashes XCode 4 on load

Given the correct options, qmake creates an *.xcodeproj file that is compatible with XCode 3. However, XCode 4 GM Seed crashes on load. I suspect that qmake creates an XCode version 2 file that is not compatible with version 4.
When loading with XCode 3 first, the project is converted to XCode 3 format, and loads correctly.
Crash error is:
ASSERTION FAILURE in /SourceCache/IDEXcode3ProjectSupport/IDEXcode3ProjectSupport-244/Xcode3Sources/XcodeIDE/Frameworks/DevToolsBase/pbxcore/Target.subproj/PBXTarget.m:1957
Details: configName should be a non-empty string, but it is nil
Object: <PBXNativeTarget: 0x201470000>
Method: -cachedPropertyExpansionContextForWorkspaceArenaSnapshot:configurationNamed:
Thread: <NSThread: 0x200020960>

Hints: None
This was confirmed on a variety of hardware.