If you are compiling under FreeBSD and see messages in the syslogs that indicate that the ntpd process is trying to use unavailable sched_ calls, it means you are running a kernel that does not have the POSIX scheduling calls enabled. You have two choices: - Ignore the messages - Generate a new kernel, where the kernel configuration file contains the lines: options "P1003_1B" options "_KPOSIX_PRIORITY_SCHEDULING" options "_KPOSIX_VERSION=199309L"