Undefined symbols for architecture armv7

[stephenhandley]

I'm getting the following using BlocksKit with CocoaPods.. anyone run into this?

pod 'BlocksKit', '~> 1.8.0'

Undefined symbols for architecture armv7:
  "_OBJC_CLASS_$_MFMessageComposeViewController", referenced from:
      l_OBJC_$_CATEGORY_MFMessageComposeViewController_$_BlocksKit in libPods.a(MFMessageComposeViewController+BlocksKit.o)
  "_OBJC_CLASS_$_MFMailComposeViewController", referenced from:
      l_OBJC_$_CATEGORY_MFMailComposeViewController_$_BlocksKit in libPods.a(MFMailComposeViewController+BlocksKit.o)
  "_OBJC_CLASS_$_ASIdentifierManager", referenced from:
      objc-class-ref in libPods.a(FBSettings.o)
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

[a2]

Try linking against the MessageUI framework.