anchor.diff:  
   buildPythonPackage rec {
     pname = "pelican";
  -  version = "4.5.0";
  +  version = "4.5.4";
   
     disabled = isPy27;
   
  
positive.code:     owner = "getpelican";
      repo = "pelican";
      rev = version;
      sha256 = "0p8p84fcpkr19d54dhxvldd8ijbg334wmrmkr99pnbrdl1gf64qi";
      # 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_basic_generation_works \
        --exclude=test_custom_generation_works \
        --exclude=test_custom_locale_generation_works \
        --exclude=test_log_filter \
        pelican
  