anchor.diff:          else ""}
     '';
   
  -  buildInputs = [ zlib lzo libtasn1 pkgconfig ]
  +  buildInputs = [ zlib lzo libtasn1 pkgconfig perl ]
       ++ stdenv.lib.optional guileBindings guile;
   
     propagatedBuildInputs = [ nettle ];
  
positive.code:   })];
  
    configurePhase = ''
      ./configure --prefix="$out"                                 \
        --disable-dependency-tracking --enable-fast-install       \
        --with-lzo --with-libtasn1-prefix="${libtasn1}"		\
  
negative.code: { fetchurl, stdenv, zlib, lzo, libtasn1, nettle
  , guileBindings, guile, pkgconfig, perl }:
  
  assert guileBindings -> guile != null;
  
  