anchor.diff: -{stdenv, fetchurl, pkgconfig, djvulibre, ghostscript }:
  +{ stdenv, makeWrapper, fetchurl, djvulibre, ghostscript, which }:
   
   stdenv.mkDerivation rec {
     version = "0.9.2";
  
positive.code:     description = "Creates djvu files from PDF files";
      homepage = http://0x2a.at/s/projects/djvu2pdf;
      license = stdenv.lib.licenses.gpl2;
      inherit version;
    };
  }
  
negative.code:     sha256 = "0v2ax30m7j1yi4m02nzn9rc4sn4vzqh5vywdh96r64j4pwvn5s5g";
    };
  
    nativeBuildInputs = [ makeWrapper ];
  
    installPhase = ''
      mkdir -p $out/bin
      cp -p djvu2pdf $out/bin
      wrapProgram $out/bin/djvu2pdf --prefix PATH : ${ghostscript}/bin:${djvulibre}/bin:${which}/bin
  
      mkdir -p $out/man/man1
      cp -p djvu2pdf.1.gz $out/man/man1
    '';
  