ntpsec does not build on macOS <= 10.11

Hi, I recently created a Portfile for ntpsec that got accepted into MacPorts. It came to my attention by their build bots that ntpsec does not build in any macOS version earlier than 10.12 due to the use of clock_gettime(2) that just got introduced in the current version: https://trac.macports.org/ticket/53928

I wonder if I can expect that a fallback to an alternative syscall could be implemented (or accepted as a patch) in a future release? I suspect that the answer is "no" considering that it would likely conflict with this project's goals, but it does not harm to ask.