anchor.diff:      for program in $out/bin/*; do
         wrapProgram $program \
           ''${qtWrapperArgs[@]} \
  -        ''${gappsWrapperArgs[@]} \
           --prefix PYTHONPATH : $PYTHONPATH \
           --prefix PATH : ${poppler_utils.out}/bin
       done
  
positive.code: 
    # Wrap manually
    dontWrapQtApps = true;
    dontWrapGApps = true;
  
    # Remove some references to shrink the closure size. This reference (as of
    # 2018-11-06) was a single string like the following:
  
negative.code: , xdg-utils
  , removeReferencesTo
  , libstemmer
  , wrapGAppsHook
  }:
  
  mkDerivation rec {
    pname = "calibre";
    version = "5.37.0";
  
    src = fetchurl {
      url = "https://download.calibre-ebook.com/${version}/${pname}-${version}.tar.xz";
      hash = "sha256-x2u4v0k05WMATSsuo76NnqChIz8BcTuZfPkZa0uLnMY=";
    };
  
    # https://sources.debian.org/patches/calibre/${version}+dfsg-1
  