title: Xcode 10+: how to switch to legacy build system?
body: <p>There seem to be some <a href="https://stackoverflow.com/q/50552752/45813">problems</a> with the new build system in Xcode 10. How do I switch to the old (legacy) build system?</p>
  <hr />
  <p><strong>NOTE:</strong> While one can apparently still use it for a bit longer (in June 2022), the legacy build system is marked deprecated in Xcode 13.4.1)</p>