anchor.diff:    binDists = {
       x86_64-linux = let bdist = bdistForArch { inUrl = "linux64"; inTar = "x64"; }; in {
         alpha = {
  -        stable        = bdist { sha256 = "0b4hbpdcrh5hgip9q5dkmw22p66lcdhnr0kmb0w5dw6yi7fnxxh0"; version = "0.16.51"; withAuth = true; };
  -        experimental  = bdist { sha256 = "1q66chnxsdlaz1bj3al62iikyxvknj1vkwh5bcc46favy4wpqpzz"; version = "0.17.52"; withAuth = true; };
  +        stable        = bdist { sha256 = "1fg2wnia6anzya4m53jf2xqwwspvwskz3awdb3j0v3fzijps94wc"; version = "0.17.79"; withAuth = true; };
  +        experimental  = bdist { sha256 = "1fg2wnia6anzya4m53jf2xqwwspvwskz3awdb3j0v3fzijps94wc"; version = "0.17.79"; withAuth = true; };
         };
         headless = {
  -        stable        = bdist { sha256 = "0zrnpg2js0ysvx9y50h3gajldk16mv02dvrwnkazh5kzr1d9zc3c"; version = "0.16.51"; };
  -        experimental  = bdist { sha256 = "03nv0qagv5pmqqbisf0hq6cb5rg2ih37lzkvcxihnnw72r78li94"; version = "0.17.52"; };
  +        stable        = bdist { sha256 = "1pr39nm23fj83jy272798gbl9003rgi4vgsi33f2iw3dk3x15kls"; version = "0.17.79"; };
  +        experimental  = bdist { sha256 = "1pr39nm23fj83jy272798gbl9003rgi4vgsi33f2iw3dk3x15kls"; version = "0.17.79"; };
         };
         demo = {
  -        stable        = bdist { sha256 = "0zf61z8937yd8pyrjrqdjgd0rjl7snwrm3xw86vv7s7p835san6a"; version = "0.16.51"; };
  +        stable        = bdist { sha256 = "07qknasaqvzl9vy1fglm7xmdi7ynhmslrb0a209fhbfs0s7qqlgi"; version = "0.17.79"; };
         };
       };
       i686-linux = let bdist = bdistForArch { inUrl = "linux32"; inTar = "i386"; }; in {
  
positive.code: { stdenv, fetchurl, makeWrapper
  , alsaLib, libX11, libXcursor, libXinerama, libXrandr, libXi, libGL
  , factorio-utils
  , releaseType
  , mods ? []
  
negative.code:     headless = base;
      demo = base // {
  
        buildInputs = [ makeWrapper libpulseaudio ];
  
        libPath = stdenv.lib.makeLibraryPath [
          alsaLib
          libpulseaudio
          libX11
          libXcursor
          libXinerama
  