anchor.diff:  , packaging
   , parameter-expansion-patched
   , pefile
  -, pkginfo
  +, pip-requirements-parser
  +, pkginfo2
   , pluggy
   , plugincode
   , publicsuffix2
  
positive.code:     click
      colorama
      commoncode
      debian-inspector
      dparse
      extractcode
      extractcode-7z
      extractcode-libarchive
  
negative.code:     typecode-libmagic
      urlpy
      xmltodict
    ] ++ lib.optionals (pythonOlder "3.9") [
      zipp
    ] ++ lib.optionals (pythonOlder "3.7") [
      typing
    ];
  