It looks like the overload taking thread::attributes as parameter does not accept variadic arguments:

```

template<typename Callable>
thread(attributes& attrs, Callable func);

```

https://www.boost.org/doc/libs/1_79_0/doc/html/thread/thread_management.html#thread.thread_management.thread.attr_callable_constructor

On Sat, May 21, 2022 at 6:18 PM Jeanette C. via Boost-users <boost-users@lists.boost.org> wrote:

May 21 2022, Glen Fernandes has written:
...
> It's as if BOOST_THREAD_PROVIDES_VARIADIC_THREAD is not defined, which
> would happen if BOOST_THREAD_VERSION is less than 4. Can you check if
> this is the case?
...
the version is 2, although the include files mention versions upto 5.
What is the recommended way to set this, please?

Best wishes,

Jeanette

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