anchor.diff:         })
       ];
   
  -  preConfigure = "autoreconf -vf";
  +  preConfigure = "autoreconf -vf";	# needed because of the patch above
   
     buildInputs =
  -    [ libX11 inputproto libXt
  -      libXpm libXft fontconfig libXtst
  -      xextproto readline libXi pkgconfig
  -      autoconf automake  # needed because of the patch above
  +    [ libX11 inputproto libXt libXpm libXft fontconfig libXtst
  +      xextproto readline libXi pkgconfig perl autoconf automake
       ];
   
     meta = {
  
positive.code: { stdenv, fetchurl, libX11, inputproto, libXt, libXpm, libXft, fontconfig
  , libXtst, xextproto, readline, libXi, pkgconfig, autoconf, automake }:
  
  stdenv.mkDerivation rec {
    name = "ratpoison-1.4.5";
  
negative.code: 
      homepage = http://www.nongnu.org/ratpoison/;
  
      maintainers = [ stdenv.lib.maintainers.ludo stdenv.lib.maintainers.simons ];
      platforms = stdenv.lib.platforms.gnu;  # arbitrary choice
    };
  }
  