fresh -CURRENT: ps: time: keyword not found

On a -CURRENT csup'd a couple of hours ago, I get a message on stderr
every time in run "ps": "ps: time: keyword not found".

For instance:
,----
| $ uname -a
| FreeBSD simias.hd.free.fr 8.0-CURRENT FreeBSD 8.0-CURRENT #0:
| Sun Oct 2810:08:04 CET 2007
| root_at_simias.hd.free.fr:/usr/obj/usr/src/sys/SIMKERNEL  i386
| $ ps
| ps: time: keyword not found
|   PID  TT  STAT COMMAND
|   943  v0  I    -zsh (zsh)
|   976  v0  I+   /bin/sh /usr/local/bin/startx
|   994  v0  I+   xinit /home/simias/.xinitrc -- -auth /home/simias/.serverauth.9
|  1000  v0  I    sh /home/simias/.xinitrc
|  1007  v0  I    /bin/sh /home/simias/bin/start-stumpwm
|  1009  v0  S    /home/simias/dev/lisp/stumpwm/stumpwm
|  1015  v0  I    /bin/sh -c rxvt
|  1016  v0  S    rxvt
|  1044  v0  I    /bin/sh -c emacs
|  1045  v0  S    emacs
|  1095  v0  I    /bin/sh -c rxvt
|  1096  v0  S    rxvt
|  1017  p0  Is   zsh
|  1028  p0  S+   screen
|  1031  p1  Is   /usr/local/bin/zsh
|  1043  p1  S+   ssh -p2223 myrix.net
|  1097  p2  Is+  zsh
`----

Any clues?

--
Lionel Flandrin