anchor.diff:    passthru = rec {
       zlibSupport = zlib != null;
       sqliteSupport = sqlite != null;
  -    dbSupport = db != null;
  +    dbSupport = false;
       readlineSupport = readline != null;
       opensslSupport = openssl != null;
       tkSupport = (tk != null) && (tcl != null) && (libX11 != null) && (xproto != null);
  
positive.code:     lzma
      gdbm
      sqlite
      db
      readline
      ncurses
      openssl
  
negative.code: { stdenv, fetchurl
  , bzip2
  , gdbm
  , libX11, xproto
  , lzma
  