Xcode Clang Formatter does not recognize AlignConsecutiveAssignment

Adding this line to the clang format file is throwing me an error (mostly keyword rejection).

AlignConsecutiveAssignment: true

My goal is obviously to have the = operator executed in the following sequences:

a        = true;
blueish  = false;

      

        
        
        
      

    

What is the way to get this with the latest Xcode 6.3.1?

Thank...