CURLOPT_SERVICE_NAME(3) on macOS

The text 1109f0f8e059, as macOS 10.12.5, macOS 10.12.4, macOS 10.12.3, macOS 10.12.2, macOS 10.12.1, macOS 10.12 shipped it.

authentication service name

CURLOPT_SERVICE_NAME(3) on macOS now