When I do an xcodebuild (headless commandline build) I get "Couldn't open shared capabilities memory GSCapabilities", but the build product is fine.

```
CompileXIB Resources/Main/InterfaceBuilder/XXX.xib
    cd /Users/xxx/xcodeprojects/XXX
    setenv IBC_MINIMUM_COMPATIBILITY_VERSION 3.1.2
    setenv PATH "/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Developer/usr/bin:/Users/xxx/xcodeprojects/iPhoneBuildScript:/Users/xxx/xcodeprojects/iPhoneBuildScript:/usr/bin:/bin:/usr/sbin:/sbin"
    /Developer/usr/bin/ibtool --errors --warnings --notices --output-format human-readable-text --compile /Users/xxx/xcodeprojects/xxx/build/Release-iphoneos/XXX.app/XXX.nib /Users/xxx/xcodeprojects/XXX/Resources/Main/InterfaceBuilder/XXX.xib --sdk /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.2.sdk

Couldn't open shared capabilities memory GSCapabilities (No such file or directory)

```

How can I fix these warnings?