dnl - On most Unix systems, use MAXHOSTNAMELEN from <sys/param.h> instead.
dnl - On Solaris, Cygwin, BeOS, use MAXHOSTNAMELEN from <netdb.h> instead.
dnl - On mingw, use 256, because
dnl - On most Unix systems, use MAXHOSTNAMELEN from <sys/param.h> instead.
dnl - On Solaris, Cygwin, BeOS, use MAXHOSTNAMELEN from <netdb.h> instead.
dnl - On mingw, use 256, because