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ntp checks for presence of sys/timepps.h to determine whether the kernel supports the RFC 2783 KPPS interface. Under Linux the pps-tools package installs this header. Without this feature the ATOM clock driver does not work, and other drivers like NMEA have reduced precision. Remove the feature non-determinism and increase ntpd capabilities by adding an explicit dependency. See: http://doc.ntp.org/4.2.6/kernpps.html Signed-off-by: Peter A. Bigot <pab@pabigot.com> Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>