Simple test program does not compile. 
It needs #include <netinet/in.h> for definition of address types.

Fix: 

/*--greYswFliVOafCACB9vo6ZaBh4fcXkfM2Cuc4IyUEDQptvym
Content-Type: text/plain; name="file.diff"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment; filename="file.diff"

*** resolv.h.orig       Fri Sep  2 18:42:55 2005
--- resolv.h    Fri Sep  2 18:44:28 2005
***************
*** 61,66 ****
--- 61,67 ----
  #include <sys/types.h>
  #include <sys/cdefs.h>
  #include <sys/socket.h>
+ #include <netinet/in.h>
  #include <stdio.h>
How-To-Repeat: compile:
#include <resolv.h>
main ()
{
}