anchor.diff:    isPy27 = python.majorVersion == "2.7";
     isPy33 = python.majorVersion == "3.3";
     isPy34 = python.majorVersion == "3.4";
  +  isPy35 = python.majorVersion == "3.5";
     isPyPy = python.executable == "pypy";
     isPy3k = strings.substring 0 1 python.majorVersion == "3";
   
  
positive.code: 
    pythonPackages = modules // {
  
    inherit python isPy26 isPy27 isPy33 isPy34 isPyPy isPy3k pythonName buildPythonPackage;
  
    # helpers
  
  
negative.code:     if isPy27 then "python27" else
      if isPy33 then "python33" else
      if isPy34 then "python34" else
      if isPy35 then "python35" else
      if isPyPy then "pypy" else "";
  
    modules = python.modules or {
  