OpenSSH 2.9p2 and later (including 3.0p1) have a configure that checks for 64
bit int types,
but it only checks sys/types.h and sys/socket.h.  Some platforms (e.g. Tru64
UNIX 5.x) have the
int64_t and u_int64_t prototypes elsewhere (e.g. sys/bitypes.h).

The patch I'll be attaching to this applies cleanly against 3.0p1 once you tell
it to use
configure.ac rather than configure.in.  The patch itself just adds sys/bitypes.h
to the list
of headers searched for the int64_t and u_int64_t prototypes.

One additional improvement that the patch does *not* address is adding
inttypes.h to the
list of headers that are searched for 64 bit prototypes.  I didn't do it because
I assumed
there must be some reason why it was left off the list (i.e. it causes problems
on some platforms?).
If that's not the case, I think it too should be added to the list of headers to
search for the
various prototypes.