Facebook iOS SDK 3.1 with XCode 4.2 linker errors

Question

I've just updated the Facebook iOS SDK in my project from 3.0 to 3.1. The project does not compile anymore. Instead I get the following linker errors:

Undefined symbols for architecture i386:
  "_ACFacebookAppIdKey", referenced from:
      -[FBSession authorizeUsingSystemAccountStore:accountType:permissions:defaultAudience:isReauthorize:] in FacebookSDK(FBSession.o)
  "_ACFacebookAudienceEveryone", referenced from:
      -[FBSession authorizeUsingSystemAccountStore:accountType:permissions:defaultAudience:isReauthorize:] in FacebookSDK(FBSession.o)
  "_ACFacebookAudienceFriends", referenced from:
      -[FBSession authorizeUsingSystemAccountStore:accountType:permissions:defaultAudience:isReauthorize:] in FacebookSDK(FBSession.o)
  "_ACFacebookAudienceKey", referenced from:
      -[FBSession authorizeUsingSystemAccountStore:accountType:permissions:defaultAudience:isReauthorize:] in FacebookSDK(FBSession.o)
  "_ACFacebookAudienceOnlyMe", referenced from:
      -[FBSession authorizeUsingSystemAccountStore:accountType:permissions:defaultAudience:isReauthorize:] in FacebookSDK(FBSession.o)
  "_ACFacebookPermissionsKey", referenced from:
      -[FBSession authorizeUsingSystemAccountStore:accountType:permissions:defaultAudience:isReauthorize:] in FacebookSDK(FBSession.o)
  "_OBJC_CLASS_$_ASIdentifierManager", referenced from:
      objc-class-ref in FacebookSDK(FBSettings.o)
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

The Facebook docs clearly say:

The SDK relies on three other frameworks (AdSupport, Accounts and Social) to use the Facebook features built into iOS6.

Those frameworks do not exist in Xcode 4.2 . Is there any workaround, i.e. can I download (where?) and add the frameworks manually to my project and will that suffice to get rid of the compile errors or do I have to upgrade to Xcode 4.5?

Answer 1

Those frameworks are part of iOS 6 (well, except for Accounts, which is from iOS 5). You won't be able to use them without upgrading to Xcode 4.5, and consequently, iOS 6 SDK.

You can still set your deployment target down to iOS 4.3, if that's your concern.

I think your options are:

1. Upgrade to Xcode 4.5, or
2. Use Facebook SDK 3.0.