anchor.diff:  , pandas
   , pyyaml
   , matplotlib
  -, pytest
  +, numba
  +, pytestCheckHook
   }:
   
   buildPythonPackage rec {
  
positive.code:     homepage = "https://github.com/soft-matter/trackpy";
      license = licenses.bsd3;
      maintainers = [ maintainers.costrouc ];
      broken = true; # not compatible with latest pandas
    };
  }
  
negative.code:     pandas
      pyyaml
      matplotlib
      numba
    ];
  
    checkInputs = [
      pytestCheckHook
    ];
  
    preCheck = lib.optionalString stdenv.isDarwin ''
      # specifically needed for darwin
      export HOME=$(mktemp -d)
      mkdir -p $HOME/.matplotlib
      echo "backend: ps" > $HOME/.matplotlib/matplotlibrc
    '';
  
    meta = with lib; {
  