{
  thirdparty = [
    {
      url = "https://github.com/LuaJIT/LuaJIT";
      rev = "8635cbabf3094c4d8bd00578c7d812bea87bb2d3";
      hash = "sha256-8ij/Zjss8Rz5fKL9LJuRiTQdoT9OVMNOY1a4D2hRcEU=";
      name = "luajit";
    }
    {
      url = "https://github.com/libjpeg-turbo/libjpeg-turbo.git";
      rev = "3.0.0";
      hash = "sha256-CEqlV/LzF5okvPwUDyqDBvL4bTGc6TYqfADHtRLPJb4=";
      name = "libjpeg-turbo";
    }
    {
      url = "https://gitlab.com/koreader/djvulibre.git";
      rev = "6a1e5ba1c9ef81c205a4b270c3f121a1e106f4fc";
      hash = "sha256-H0HWR+hpAYLGbBdY3BwxgKPUrWhrIsVMnoURdbn8iIE=";
      name = "djvulibre";
    }
  ];

  externalProjects = {
    zlib = {
      url = "http://gentoo.osuosl.org/distfiles/zlib-1.2.13.tar.xz";
      hash = "sha256-0Uw44xOvw1qah2Da3yYEL1HqD10VSwYwox2gVAEH+5g=";
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}