Log Message:
Update to 5.7p4, provided by Paul B. Henson in PR 49930:

Changes since OpenNTPD 5.7p3
============================
* Added support for using HTTPS time constraints to validate NTP responses.

* Workaround a bug in the Solaris adjtime call that caused the olddelta to
  never reach 0, leading to continual sync/unsync messages from ntpd.

* Workaround an overflow on systems with 32-bit time_t. This can result in a
  failure to set the time if the initial clock is set later than early 2036.
  Systems with a 32-bit time_t should upgrade well in advance of this date, but
  today this helps with systems that boot with an invalid initial time.

Note:the HTTPS time constraints feature is not currently available
in pkgsrc due to the lack of libtls.