fork error?

["Nicholas Lee" <nj.lee@kiwa.co.nz>]

What is this particular error?  It worries me somewhat because it causes
other programs (like top)  to have the same problem (for the same user)
while this error occurs.  After some while the error disappears and it
continues past this point.

[nic@woodcut:~/src/courier-imap-0.27] make check
[...]
Making check in userdb
Making check in authlib
Making check in waitlib
./testwait
fork: Resource temporarily unavailable
fork: Resource temporarily unavailable
^C
...


Nicholas