anchor.diff:      description = "Multi-protocol instant messaging client";
       homepage = "http://pidgin.im";
       license = licenses.gpl2Plus;
  -    platforms = platforms.linux;
  +    platforms = platforms.unix;
       maintainers = [ maintainers.vcunat ];
     };
   };
  
positive.code:     "--disable-meanwhile"
      "--disable-nm"
      "--disable-tcl"
    ]
    ++ (lib.optionals (cyrus_sasl != null) [ "--enable-cyrus-sasl=yes" ])
    ++ (lib.optionals (gnutls != null) ["--enable-gnutls=yes" "--enable-nss=no"]);
  
negative.code: { stdenv, fetchurl, makeWrapper, pkgconfig, gtk2, gtk2-x11
  , gtkspell2, aspell
  , gst_all_1, startupnotification, gettext
  , perlPackages, libxml2, nss, nspr, farstream
  , libXScrnSaver, ncurses, avahi, dbus, dbus-glib, intltool, libidn
  