Bug 23082

I've tryed to install Trimble Acutime II GPS receiver on FreeBSD server and found that by default (in /usr/src/usr.sbin/ntp/config.h ) only one ref-clock parser ( RawDCF  ) is enabled while Generic reference driver 'PARSE' understands more types of ref-clocks.  In my case this produce completely cryptic error message 'parse_setfmt FAILED' and only digging into the sources showed that my GPS receiver is just not supported which is not mentioned in the man or documentation.

It's necesary to make possible to add other drivers and parsers to ntpd by specifying them in /etc/make.conf or just include them all as it was in xntpd. This could possible by overriding macro CLOCKDEFS if its definition in /usr/src/usr.sbin/ntp/Makefile.inc would change from 'CLOCKDEFS=' to 'CLOCKDEFS?='. Then specifing 
CLOCKDEFS=-DCLOCK_TRIMTSIP compiles Trimble support into ntpd.

Fix: 

DEFS_LOCAL= -DPARSE -DHAVE_CONFIG_H
  NTPDEFS=   -DSYS_FREEBSD
! CLOCKDEFS=
  #     -DLOCAL_CLOCK -DPST -DWWVB -DAS2201 -DGOES -DGPSTM -DOMEGA \
  #     -DLEITCH -DTRAK -DACTS -DATOM -DDATUM -DHEATH -DMSFEES \
  #     -DMX4200 -DNMEA -DBOEDER
--- 4,10 ----

  DEFS_LOCAL= -DPARSE -DHAVE_CONFIG_H
  NTPDEFS=   -DSYS_FREEBSD
! CLOCKDEFS?=
  #     -DLOCAL_CLOCK -DPST -DWWVB -DAS2201 -DGOES -DGPSTM -DOMEGA \
  #     -DLEITCH -DTRAK -DACTS -DATOM -DDATUM -DHEATH -DMSFEES \
  #     -DMX4200 -DNMEA -DBOEDER--hXYlyRHksbZUq2ixotU7L9OM7tBhe6oAdiid7IbSS1Zv5kb9
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*** Makefile.inc.orig   Fri Nov 24 20:39:22 2000
--- Makefile.inc        Fri Nov 24 21:13:20 2000
*************** MAINTAINER=     roberto
*** 4,10 ****
How-To-Repeat: root@host# echo server 127.127.8.0 mode 10 >> /etc/ntp.conf
root@host# ntpd -d
...
...ntpd[1234]: PARSE receiver #0: parse_start: parse_setfmt()AILED