anchor.diff:      mv $name $emacsName
     '';
   
  -  preConfigure = ''
  -    substituteInPlace lisp/international/mule-cmds.el --replace /usr $TMPDIR
  -    substituteInPlace Makefile.in --replace "/bin/pwd" "pwd"
  -    substituteInPlace lib-src/Makefile.in --replace "/bin/pwd" "pwd"
  -
  +  postPatch = ''
       patch -p1 < patch-mac
  -
  -    # The search for 'tputs' will fail because it's in ncursesw within the
  -    # ncurses package, yet Emacs' configure script only looks in ncurses.
  -    # Further, we need to make sure that the -L option occurs before mention
  -    # of the library, so that it finds it within the Nix store.
  -    sed -i 's/tinfo ncurses/tinfo ncursesw/' configure
  -    ncurseslib=$(echo ${ncurses}/lib | sed 's#/#\\/#g')
  -    sed -i "s/OLIBS=\$LIBS/OLIBS=\"-L$ncurseslib \$LIBS\"/" configure
  -    sed -i 's/LIBS="\$LIBS_TERMCAP \$LIBS"/LIBS="\$LIBS \$LIBS_TERMCAP"/' configure
  -
  -    configureFlagsArray=(
  -      LDFLAGS=-L${ncurses}/lib
  -      --with-xml2=yes
  -      --with-gnutls=yes
  -      --with-mac
  -      --enable-mac-app=$out/Applications
  -    )
  -    makeFlagsArray=(
  -      CFLAGS=-O3
  -      LDFLAGS="-O3 -L${ncurses}/lib"
  -    );
  +    sed -i 's|/usr/share/locale|${gettext}/share/locale|g' lisp/international/mule-cmds.el
     '';
   
  +  configureFlags = [
  +    "LDFLAGS=-L${ncurses}/lib"
  +    "--with-xml2=yes"
  +    "--with-gnutls=yes"
  +    "--with-mac"
  +    "--enable-mac-app=$$out/Applications"
  +  ];
  +
  +  CFLAGS = "-O3";
  +  LDFLAGS = "-O3 -L${ncurses}/lib";
  +
     postInstall = ''
  -    cat >$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)))
  -
  -    ;; make tramp work for NixOS machines
  -    (eval-after-load 'tramp '(add-to-list 'tramp-remote-path "/run/current-system/sw/bin"))
  -    EOF
  +    mkdir -p $out/share/emacs/site-lisp/
  +    cp ${./site-start.el} $out/share/emacs/site-lisp/site-start.el
     '';
   
     doCheck = true;
  
positive.code: { stdenv, fetchurl, ncurses, pkgconfig, texinfo, libxml2, gnutls
  , Carbon, Cocoa, ImageCaptureCore, OSAKit, Quartz, WebKit
  }:
  
  stdenv.mkDerivation rec {
    emacsName = "emacs-24.5";
    name = "${emacsName}-mac-5.15";
  
    #builder = ./builder.sh;
  
    src = fetchurl {
      url = "mirror://gnu/emacs/${emacsName}.tar.xz";
  
negative.code:   enableParallelBuilding = true;
  
    buildInputs = [
      ncurses libxml2 gnutls pkgconfig texinfo gettext
    ];
  
    propagatedBuildInputs = [
      Carbon Cocoa ImageCaptureCore OSAKit Quartz WebKit AppKit GSS ImageIO
    ];
  
    postUnpack = ''
  