anchor.diff:    };
   
     meta = {
  +    homepage = "http://www.gnu.org/software/groff/";
       description = "GNU Troff, a typesetting package that reads plain text and produces formatted output";
  +    license = "GPLv3+";
   
       longDescription = ''
         groff is the GNU implementation of troff, a document formatting
  
positive.code:       version gxditview of the X11 xditview previewer, and an
        implementation of the -mm macros.
      '';
  
      homepage = http://www.gnu.org/software/groff/;
  
      license = "GPLv3+";
    };
  }
  
negative.code: { stdenv, fetchurl, ghostscript, perl, groff }:
  
  stdenv.mkDerivation rec {
    name = "groff-1.22.2";
  
    src = fetchurl {
      url = "mirror://gnu/groff/${name}.tar.gz";
      sha256 = "0xi07nhj5vdgax37rj25mwxzdmsz1ifx50hjgc6hqbkpqkd6821q";
    };
  
    buildInputs = [ ghostscript ];
  