anchor.diff:  , fetchPypi
   , autopage
   , cmd2
  +, installShellFiles
  +, openstackdocstheme
   , pbr
   , prettytable
   , pyparsing
   , pyyaml
   , stevedore
  +, sphinx
   , callPackage
   }:
   
  
positive.code:     pyyaml
      stevedore
    ];
  
    # check in passthru.tests.pytest to escape infinite recursion with stestr
    doCheck = false;
  
negative.code:     rm test-requirements.txt
    '';
  
    nativeBuildInputs = [
      installShellFiles
      openstackdocstheme
      sphinx
    ];
  
    propagatedBuildInputs = [
      autopage
      cmd2
  