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Editorial Team
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Asked: 2026-05-23T12:11:58+00:00

I can’t seem to find the answer. I’ve just used Xcode 4 final version

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I can’t seem to find the answer.

I’ve just used Xcode 4 final version and built an existing project that was built ok with Xcode 3, but got this error:

ld: library not found for -lSystem.B
collect2: ld returned 1 exit status
Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc-4.2 failed with exit code 1

But another project was built OK with Xcode 4.

I installed Xcode 4 by choosing the default options.

Do I miss to include a library or framework somewhere?

Could somebody please help. Thank you.

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1 Answer

  1. Editorial Team

    Here’s my solution for Xcode 4.0.2 with SDK 4.3 environment, but I believe it should also work on other setups.

    1. libSystem.B.dylib is not present
      under
      /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.3.sdk/usr/lib,
      however it is present for lower SDK
      versions (e.g. iPhoneOS4.2.sdk)
    2. most of the cases
      libSystem.B.dylib is just a
      symbolic link to libSystem.dylib
    3. so in
      iPhoneSimulator4.3.sdk/usr/lib
      I’ve applied following command sudo
      ln -s libSystem.dylib
      libSystem.B.dylib       and my simulator
      builds started to work again 🙂

    NOTE: libSystem.B.dylib is used by Flurry and Urban Airship so you better don’t delete the reference in project file (of course Urban Airship does not work under Simulator, but I think Flurry does. libSystem.B.dylib may also be required by other libraries you included to your project.

    UPDATE: solution still works for iOS5 Simulator after upgrading to Xcode 4.3

    UPDATE, March 9th, 2k12: for Xcode installations via App Store, prefix above path with /Applications/Xcode.app/Contents or the path where you’ve installed Xcode.app.

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