AC_CHECK_LIB([nixexpr], [_ZN3nix9EvalState8evalFileERKSsRNS_5ValueE], [:],

AC_CHECK_LIB([nixexpr], [_ZN3nix9EvalStateC1ERKSt4listISsSaISsEE], [:],

    EvalState state;

    /* FIXME: hack */
    Strings searchPath;
    Strings args2;
    for (Strings::iterator i = args.begin(); i != args.end(); ) {
        string arg = *i++;
        if (!parseSearchPathArg(arg, i, args.end(), searchPath))
            args2.push_back(arg);
    }
    args = args2;
    EvalState state(searchPath);

        else if (parseSearchPathArg(arg, i, args.end(), state))
            ;