[LinuxPPS] NMEA and NTP

[Paul]

I am using 2.6.34 and ntp-4.2.6p1 (compiled using ./configure
--disable-all-clocks --disable-parse-clocks --enable-NMEA
--enable-LOCAL-CLOCKS)

1. The page on the ntp site for reference clock 20 says that you must
use fudge1 1  But no mention of this on the Wiki. Is it required to use
PPS or not?

2. (More serious). My NMEA lock appears to be working (as far as I can
see) with only the NMEA as a reference. But I cannot add an external
peer. When I do so, 2 ntpd processes are started, but I only see the
NMEA source when I do ntpq -p. Wierd. And with external sources only,
still two ntp processes are started but there are no references in ntpq
-p The ntp also does not appear to write to a driftfile even though I
have specified it in ntp.conf
Am I missing something required by the compilation? Ntp requires texinfo
for instance which is most unusual.