Ok.  I was doing a ps to see what is running right now in my machine,
after rebuilding my kernel (to install netatalk and samba),

> ps
ps: proc size mismatch (1472 total, 696 chunks).
ps: statfs on /proc failed: No such file or directory
ps: fallback /proc-based lookup also failed.  Giving up...
>

and found I have the problem that has been described in
http://www.netbsd.org/Documentation/misc/index.html#proc-size-mismatch
The prescribed solution seems to require recompiling quite a lot of
binaries to get it to work.  Is that the only solution?  As you can see,

> df
Filesystem  512-blocks     Used    Avail Capacity  Mounted on
/dev/rz0a        63342    51456     8718    85%    /
/dev/rz0d       434748   342264    70746    82%    /usr
/dev/rz0f       395114    85844   289514    22%    /home
kernfs               2        2        0   100%    /kern
>

I did not give much space in /usr in my little 540MB HD to put all the
source files.  What else could I do?  

	If it sound slike I am trying to find an easier/lazeir way out, it is the
case =)