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{ stdenv, fetchurl, ncurses, x11, libXaw, libXpm, Xaw3d
, pkgconfig, gtk, libXft, dbus, libpng, libjpeg, libungif
, libtiff, librsvg, texinfo, gconf, libxml2, imagemagick, gnutls
, alsaLib
}:

# XXX: ?
# - checking for alsa >= 1.0.0... no
# - checking for Wand >= 6.2.8... no
# - imagemagickBig instead of imagemagick?

assert (gtk != null) -> (pkgconfig != null);
assert (libXft != null) -> libpng != null;	# probably a bug
assert stdenv.isDarwin -> libXaw != null;	# fails to link otherwise

stdenv.mkDerivation rec {
  name = "emacs-24.0.92";

  builder = ./builder.sh;

  src = fetchurl {
    url = "http://alpha.gnu.org/gnu/emacs/pretest/${name}.tar.gz";
    sha256 = "0pwps72zj7mm6asly1vdq46dcj3in4qrkb6ss9xq6nbf039nj4w6";
  };

  buildInputs = 
    [ ncurses x11 texinfo libXaw Xaw3d libXpm libpng libjpeg libungif
      libtiff librsvg libXft gconf libxml2 imagemagick gnutls alsaLib
    ] 
    ++ stdenv.lib.optionals (gtk != null) [ gtk pkgconfig ]
    ++ stdenv.lib.optional stdenv.isLinux dbus;

  configureFlags =
    stdenv.lib.optionals (gtk != null) [ "--with-x-toolkit=gtk" "--with-xft"]

    # On NixOS, help Emacs find `crt*.o'.
    ++ stdenv.lib.optional (stdenv ? glibc)
         [ "--with-crt-dir=${stdenv.glibc}/lib" ];

  postInstall = ''
    cat >$out/share/emacs/site-lisp/site-start.el <<EOF
;; nixos specific load-path
(when (getenv "NIX_PROFILES") (setq load-path
                      (append (reverse (mapcar (lambda (x) (concat x "/share/emacs/site-lisp/"))
                                               (split-string (getenv "NIX_PROFILES"))))
                       load-path)))
EOF
  '';

  doCheck = true;

  meta = {
    description = "PRETEST: GNU Emacs 24.x, the extensible, customizable text editor";

    longDescription = ''
      GNU Emacs is an extensible, customizable text editor—and more.  At its
      core is an interpreter for Emacs Lisp, a dialect of the Lisp
      programming language with extensions to support text editing.

      The features of GNU Emacs include: content-sensitive editing modes,
      including syntax coloring, for a wide variety of file types including
      plain text, source code, and HTML; complete built-in documentation,
      including a tutorial for new users; full Unicode support for nearly all
      human languages and their scripts; highly customizable, using Emacs
      Lisp code or a graphical interface; a large number of extensions that
      add other functionality, including a project planner, mail and news
      reader, debugger interface, calendar, and more.  Many of these
      extensions are distributed with GNU Emacs; others are available
      separately.
    '';

    homepage = http://www.gnu.org/software/emacs/;
    license = "GPLv3+";

    maintainers = with stdenv.lib.maintainers; [ ludo simons chaoflow ];
    platforms = stdenv.lib.platforms.all;
  };
}