anchor.diff:                   sed -i -e 's/^povgroup.*/povgroup=nogroup/' Makefile.{am,in}
                  '';
   
  -  configureFlags = [ "COMPILED_BY='nix'" "--with-boost-thread=boost_thread" ];
  +  configureFlags = [ "COMPILED_BY='nix'" "--with-boost-thread=boost_thread" "--with-x" ];
   
     enableParallelBuilding = true;
     
  
positive.code: { stdenv, fetchFromGitHub, autoconf, automake, boost
  , zlib, libpng, libjpeg, libtiff
  }:
  
  stdenv.mkDerivation rec {
  
negative.code:   };
  
  
    buildInputs = [ autoconf automake boost zlib libpng libjpeg libtiff x11 SDL ];
  
    # the installPhase wants to put files into $HOME. I let it put the files
    # to $TMPDIR, so they don't get into the $out
  