anchor.diff: -{stdenv, fetchFromGitHub, unzip, zip, perl, aspell, dos2unix}:
  +{stdenv, fetchFromGitHub, unzip, zip, perl, aspell, dos2unix, singleWordlist ? null}:
   stdenv.mkDerivation rec {
     name = "${pname}-${version}";
     pname = "scowl";
  
positive.code: 
    enableParallelBuilding = false;
  
    installPhase = ''
      eval "$preInstall"
  
      mkdir -p "$out/share/scowl" 
  
negative.code:         fi
  
          echo $region $regcode $regcode_sz
          for s in 10 20 30 35 40 50 55 60 70 80 90 95; do
            ./mk-list $regcode $s > "$out/share/dict/w$region.$s"
            ./mk-list --variants=1 $regcode_var $s > "$out/share/dict/w$region.variants.$s"
            ./mk-list --variants=2 $regcode_var $s > "$out/share/dict/w$region.acceptable.$s"
  