The infinite diversity of UNIX platforms is an eternal source of joy.

The infinite diversity of UNIX platforms is an eternal source of joy.
On some platforms (e.g., Solaris 2.5.1 and 2.6, at least), you have to
include <netdb.h> to get MAXHOSTNAMELEN defined, including <sys/param.h>
doesn't do it (on others, <netdb.h> doesn't help, and you have to
include <sys/param.h>.

Include <netdb.h> in some files, but, for "timed.h", just use 256 rather
than MAXHOSTNAMELEN - the Berkeley time daemon protocol spec (in the
timed source directory in various BSDs) says the packet includes "A
zero-terminated string of up to 256 ASCII characters with the name of
the machine sending the message."