anchor.diff:      sha256 = "01r013l8zyfkgmqn05axh3rlfsjwd6j403w5ffl7nby4i2spiw1f";
     };
   
  -  buildInputs = [qt4 bison flex eigen boost mesa glew opencsg cgal gmp mpfr];
  +  buildInputs = [ qt4 bison flex eigen boost mesa glew opencsg cgal gmp mpfr ];
   
     configurePhase = ''
       export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -I$(echo ${eigen}/include/eigen*) "
  
positive.code: {stdenv, fetchurl, qt4, bison, flex, eigen, boost, mesa, glew, opencsg, cgal
    , mpfr, gmp
    }:
  
  stdenv.mkDerivation rec {
    version = "2013.01";
    name = "openscad-${version}";
  
    src = fetchurl {
  
negative.code:     '';
      homepage = "http://openscad.org/";
      license = stdenv.lib.licenses.gpl2;
      platforms = stdenv.lib.platforms.linux;
      maintainers = with stdenv.lib.maintainers; 
        [ bjornfor raskin the-kenny ];
    };
  }
  