config.nix

{
  allowUnfree = true;

  packageOverrides = pkgs: with pkgs; rec {
    nixFontsConf = stdenv.mkDerivation {
      name = "nix-fonts-conf";
      version = "0.0.1";

      src = makeFontsConf {
        fontDirectories = [
          vistafonts
          dejavu_fonts
          anonymousPro
          nanum-gothic-coding
        ];
      };
      dontUnpack = true;

      installPhase = ''
        mkdir -p $out/etc/fonts
        cp $src $out/etc/fonts/fonts.conf
      '';
    };

    customEmacs = symlinkJoin {
      name = "custom-emacs";

      paths = [
        emacs
      ];

      buildInputs = [
        makeWrapper
      ];

      postBuild = ''
        rm $out/share/applications/*
        cp $emacs/share/applications/* $out/share/applications/

        for bin in $out/bin/*
        do
          wrapProgram $bin --set FONTCONFIG_FILE $nixFontsConf/etc/fonts/fonts.conf
        done
      '';

      inherit nixFontsConf emacs;
    };
  };
}