Frank DeChellis wrote:
> ../libclamav/.libs/libclamav.so: undefined reference to `readdir_r'
> collect2: ld returned 1 exit status

This is the interesting line. So my guess was wrong; it wasn't related 
to threading. The problem is that NetBSD 1.6.2 does not have a function 
called readdir_r.

The weird thing is that clamav checks whether a readdir_r function is 
available and uses another one if it isn't. But that check seems to 
return the wrong result. Can you please run "make configure; make debug" 
and post the output here?

Roland