anchor.diff:  
     meta = {
       homepage = https://github.com/CanonicalLtd/lightdm;
  -    description = "A cross-desktop display manager.";
  +    description = "A cross-desktop display manager";
       platforms = platforms.linux;
       license = licenses.gpl3;
       maintainers = with maintainers; [ ocharles worldofpeace ];
  
positive.code:     "--sysconfdir=/etc"
      "--disable-tests"
      "--disable-static"
    ] ++ optional withQt4 "--enable-liblightdm-qt"
      ++ optional withQt5 "--enable-liblightdm-qt5";
  
    installFlags = [
      "sysconfdir=\${out}/etc"
      "localstatedir=\${TMPDIR}"
    ];
  
  
negative.code: { stdenv, fetchFromGitHub, pam, pkgconfig, autoconf, automake, libtool, libxcb
  , glib, libXdmcp, itstool, intltool, libxklavier, libgcrypt, audit, busybox
  , polkit, accountsservice, gtk-doc, gnome3, gobject-introspection, vala, fetchpatch
  , withQt4 ? false, qt4
  , withQt5 ? false, qtbase
  }:
  