How do you turn lastcomm on?

[karl_kleinpaste at cis.ohio-state.edu]

KSpagnol at massey.ac.nz writes:
   Filename is growing, but lastcomm reports nothing new.
   (I was told to start accton in the att universe, but
   have tried both with no luck).  The man page says little
   about where lastcomm gets its info.  

[119] [10:29am] tut:/n/giza/0/karl> strings /usr/ucb/lastcomm | grep / | fgrep -v '@(#)'
`/usr/adm/pacct
4.9 (Berkeley) 9/8/83
/dev
/dev
/dev/
/etc/passwd
/etc/netgroup
Cycle detected in /etc/netgroup: %s.
syntax error in /etc/netgroup
/etc/netgroup
innetgr: syntax error in /etc/netgroup
innetgr: syntax error in /etc/netgroup
innetgr: syntax error in /etc/netgroup
[120] [10:30am] tut:/n/giza/0/karl> 

It's getting it from /usr/adm/pacct, confirmed by poking at the
source.  lastcomm works fine here, running 4.4c.

--karl