Undefined symbols for architecture armv7? What does this error mean?

Question

I just marked all of my CocoaAsyncSocket code as non-ARC code, and it's given me these 3 errors:

Undefined symbols for architecture armv7:
  "_kCFStreamNetworkServiceTypeVoIP", referenced from:
      -[GCDAsyncSocket enableBackgroundingOnSocketWithCaveat:] in GCDAsyncSocket.o
  "_kCFStreamNetworkServiceType", referenced from:
      -[GCDAsyncSocket enableBackgroundingOnSocketWithCaveat:] in GCDAsyncSocket.o
  "_kCFStreamPropertySSLSettings", referenced from:
      -[GCDAsyncSocket maybeStartTLS] in GCDAsyncSocket.o
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Does anybody know what this means and how to fix it?

Answer 1

I think I found the solution to this, by looking in the code comments, but I now see that it's also what Mark Adams suggested above. I had the errors until I added the CFNetwork.framework under Targets->Build Phases->Link Binary With Libraries->Select CFNetwork.framework