Solaris machines (Sunos 5.x)
----------------------------
1.
If the code can't find cdefs.h and/or bitypes.h

The cdefs.h and bitypes.h and netdb.h files belong to bind which can 
be obtained from: ftp://ftp.isc.org/isc/bind/src


2.
Compiling with the strictest warning settings will return warnings of the
sort:
          "warning: function declaration isn't a prototype"
This is due to a problem with signal() on these systems where the SIG_IGN
and SIG_DFL macros contain function declarations (as part of a typecast,
presumably) which are not prototypes. They can safely be ignored. I
couldn't get rid of them because they deal with the system include files,
not anything that we have control over.