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Editorial Team
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Asked: 2026-06-11T16:14:06+00:00

I’ve just updated Xcode 4.5 via the App Store, from my previous version which

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I’ve just updated Xcode 4.5 via the App Store, from my previous version which I got from my Apple Developer Account. Since the update I can’t compile any apps into the Simulator. I can compile onto a device, e.g. my iPhone.

The error I recieve is 

    fatal error: file 
    '/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/
Developer/SDKs/iPhoneSimulator6.0.sdk/usr/include/Availability.h'
         has been modified since the precompiled header was built

1 error generated.
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1 Answer

  1. Editorial Team

    go in ~/Library/Developer/Xcode/DerivedData/{project name + gobly-gook} and delete folder with your project name.

    EDIT After suggestion

    NOTE:

    By default Library Folder is hidden so we can’t see it.
    So we have three way to use this hidden ~/Library folder

    1.Unhide Library folder by following command to unhide ~/Library folder

    chflags nohidden ~/Library

    Now you can see Library folder as /Users//Library

    2. Open GO menu of finder and press Alt key and Library will be visible as new menu item.
    Select that to open Library folder

    3. You can access ~/Library folder by Terminal.

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