MGTwitterEngine yajl error

I'm trying to get MGTwitterEngine to work for the iPhone SDK. But getting the following error

Undefined symbols for architecture i386:
  "_yajl_alloc", referenced from:
      -[MGTwitterYAJLParser initWithJSON:delegate:connectionIdentifier:requestType:responseType:URL:deliveryOptions:] in MGTwitterYAJLParser.o
  "_yajl_parse", referenced from:
      -[MGTwitterYAJLParser initWithJSON:delegate:connectionIdentifier:requestType:respons开发者_JAVA技巧eType:URL:deliveryOptions:] in MGTwitterYAJLParser.o
  "_yajl_get_error", referenced from:
      -[MGTwitterYAJLParser initWithJSON:delegate:connectionIdentifier:requestType:responseType:URL:deliveryOptions:] in MGTwitterYAJLParser.o
  "_yajl_free_error", referenced from:
      -[MGTwitterYAJLParser initWithJSON:delegate:connectionIdentifier:requestType:responseType:URL:deliveryOptions:] in MGTwitterYAJLParser.o
  "_yajl_free", referenced from:
      -[MGTwitterYAJLParser initWithJSON:delegate:connectionIdentifier:requestType:responseType:URL:deliveryOptions:] in MGTwitterYAJLParser.o
ld: symbol(s) not found for architecture i386
collect2: ld returned 1 exit status

Any idea? Thanks in advance for any help!

In your build target, you need to exclude the files whose names contain "YAJL".

If you're using Xcode 4, this should be accessible in your target's Build Phases, under "Compile Sources".