anchor.diff:      description = "Provides tools for working with pair and embedded atom method potential models including tabulation routines for DL_POLY and LAMMPS";
       license = licenses.mit;
       maintainers = [ maintainers.costrouc ];
  +    broken = true; # missing cexprtk package
     };
   }
  
positive.code: { stdenv
  , buildPythonPackage
  , fetchPypi
  , pytest
  , future
  }:
  
  buildPythonPackage rec {
  
negative.code:   };
  
    checkInputs = [ pytest ];
    propagatedBuildInputs = [
      configparser
      future
      openpyxl
      pyparsing
      wrapt
    ];
  
    postPatch = ''
      substituteInPlace setup.py \
        --replace "wrapt==1.11.2" "wrapt~=1.11"
    '';
  
    # tests are not included with release
    doCheck = false;
  