SunOS4

I've been working to make PostgreSQL run on SunOS4 (again).

So far I have found following issues:

o c.h 's sunos4 part should not include varargs.h. (Tom has already
fixed it) Instead, stdlib.h and stdarg.h should be included.

o no RAND_MAX or EXIT_FAILURE found. I simply added them to c.h.

o regex/utils.h included twice somewhere. I added #ifndef
UTILS_H... to utils.h

o utils/adt/formatting.c rely on sprintf() returns length of formatted
strings. This is not true for SunOS4. I have changed sprintf to
snprintf.

o SunOS4 does not have strdup, strtoul. --> use backend/port/strtoul.c
etc.

o SunOS4 does not have atexit (used in psql). --> igore it

o SunOS4 does not have getopt. --> use utils/getopt.c. also getopt.h
need to be created, and checking for getopt is needed to configure.in.

o to make shared library I have added an entry for SunOS4 in
Makefile.shlib.

o to make shared libraries (such as libpgeasy.so) relying on libpq,
"ld foo.o bar.o ... -L ../libpq -lpq" is executed but fails. I
changed it to:

ld foo.o bar.o ... ../libpq.a

instead.

o pg_id needs Makefile.in.

included are patched for *7.0.x*. Sould I make same changes to 7.1?
Comments anyone?