jca and I converted %n to a syslog warning about a year ago, and the ports

jca and I converted %n to a syslog warning about a year ago, and the ports
ecosystem experienced a very good cleanup.  Time has arrived to switch (as
planned) to syslog + abort, which will result in a coredump thus identifying
the remaining culprits in a more visible fashion.
vfprintf(3) and vfwprintf(3) man pages still require documentation changes.
with jca