anchor.diff:      })
     ];
   
  +  nativeBuildInputs = [ autoreconfHook yodl perl groff util-linux texinfo ];
  +
     buildInputs = [ ncurses pcre ];
   
     configureFlags = [
  
positive.code: { lib, stdenv, fetchurl, fetchpatch, ncurses, pcre, buildPackages }:
  
  let
    version = "5.8";
  
    documentation = fetchurl {
      url = "mirror://sourceforge/zsh/zsh-${version}-doc.tar.xz";
      sha256 = "1i6wdzq6rfjx5yjrpzan1jf50hk2pfzy5qib9mb7cnnbjfar6klv";
    };
  in
  
  stdenv.mkDerivation {
  
negative.code: 
    # XXX: think/discuss about this, also with respect to nixos vs nix-on-X
    postInstall = ''
      make install.info install.html
  
      mkdir -p $out/etc/
      cat > $out/etc/zprofile <<EOF
  