anchor.diff:  
     checkInputs = [
       nose
  +    pandoc
     ];
   
     postPatch= ''
       substituteInPlace pelican/tests/test_pelican.py \
         --replace "'git'" "'${git}/bin/git'"
  -
  -    # Markdown-3.1 changed footnote separator to colon
  -    # https://github.com/getpelican/pelican/issues/2493#issuecomment-491723744
  -    sed -i '/test_article_with_footnote/i\
  -        @unittest.skip("")' pelican/tests/test_readers.py
     '';
   
     LC_ALL="en_US.UTF-8";
  -
   
     # We only want to patch shebangs in /bin, and not those
     # of the project scripts that are created by Pelican.
  
positive.code: { stdenv, buildPythonPackage, fetchFromGitHub
  , glibcLocales, git
  , mock, nose, markdown, lxml, typogrify
  , jinja2, pygments, docutils, pytz, unidecode, six, dateutil, feedgenerator
  , blinker, pillow, beautifulsoup4, markupsafe }:
  
  buildPythonPackage rec {
    pname = "pelican";
    version = "4.2.0";
  
    src = fetchFromGitHub {
      owner = "getpelican";
      repo = "pelican";
      rev = version;
      sha256 = "0w9nqdw2jmqc6kqwg4rh6irr5k6j7hk8axg6vgd137rs50v62yv5";
      # Remove unicode file names which leads to different checksums on HFS+
      # vs. other filesystems because of unicode normalisation.
      extraPostFetch = ''
  
negative.code: 
    # Exclude custom locale test, which files were removed above to fix the source checksum
    checkPhase = ''
      nosetests -s \
        --exclude=test_custom_locale_generation_works \
        --exclude=test_log_filter \
        pelican
    '';
  
    buildInputs = [
      glibcLocales
      pandoc
      git
      mock
      markdown
  