Milter-greylist

> > dnsrbl.c:205: undefined reference to `__ns_initparse'
> > dnsrbl.c:211: undefined reference to `__ns_parserr'
> 
> They are probably in another library. Could you look for it with nm? 

Looks like libresolv:

# nm libresolv.a | egrep 'ns_initparse|ns_parserr'
         U __ns_initparse
         U __ns_parserr
000000a0 T __ns_initparse
000002c0 T __ns_parserr