anchor.diff: -{ lib, stdenv, fetchurl, zlib, gd, texinfo4, makeWrapper, readline
  +{ lib, stdenv, fetchurl, makeWrapper, pkgconfig, texinfo
  +, cairo, gd, libcerf, pango, readline, zlib
   , withTeXLive ? false, texlive
   , withLua ? false, lua
   , emacs ? null
  
positive.code:     sha256 = "18diyy7aib9mn098x07g25c7jij1x7wbfpicz0z8gwxx08px45m4";
    };
  
    buildInputs =
      [ zlib gd texinfo4 readline pango cairo pkgconfig makeWrapper ]
      ++ lib.optional withTeXLive (texlive.combine { inherit (texlive) scheme-small; })
      ++ lib.optional withLua lua
      ++ lib.optionals withX [ libX11 libXpm libXt libXaw ]
  
negative.code:        --run '. ${./set-gdfontpath-from-fontconfig.sh}'
    '';
  
    enableParallelBuilding = true;
  
    meta = with lib; {
      homepage = http://www.gnuplot.info/;
      description = "A portable command-line driven graphing utility for many platforms";
  