anchor.diff:  { lib
   , buildPythonPackage
  -, fetchPypi
  +, fetchFromGitHub
   , isPy27
   , pyutilib
   , appdirs
   , ply
   , six
   , nose
  +, glpk
   }:
   
   buildPythonPackage rec {
  
positive.code:   version = "5.7.3";
    disabled = isPy27; # unable to import pyutilib.th
  
    src = fetchPypi {
      pname = "Pyomo";
      inherit version;
      sha256 = "2c4697107477a1b9cc9dad534d8f9c2dc6ee397c47ad44113e257732b83cfc8f";
    };
  
    checkInputs = [ nose ];
    propagatedBuildInputs = [
      pyutilib
      appdirs
  
negative.code: 
    checkPhase = ''
      rm pyomo/bilevel/tests/test_blp.py \
         pyomo/version/tests/test_installer.py \
         pyomo/common/tests/test_download.py \
         pyomo/core/tests/examples/test_pyomo.py
      export HOME=$TMPDIR
      nosetests
    '';
  
  