Can't even build simple test project [unknown type name 'clock_t']

It’s Cathy from the Open Source RT-Thread Organization. We just wanted to give you a heads-up that we’re aware of the issue that was brought up on the Forum. Our team is working hard to get it resolved, and we’ll be sure to keep you in the loop with any updates.

Thanks for your patience and understanding while we sort this out. If you have any questions or concerns, don’t hesitate to reach out to me.

I got same problem, How can fix it?