clean up implementation if you don't have getusershell(3) in libc

make NEEDGETUSERSHELL a 0/1 flag instead of a def/ndef flag

go ahead and actually implement getusershell in compat mode; too many
systems don't have it

NEXTSTEP 3.x compatibility changes

adjust declaration of getopt for ANSI C compilers

Solaris compiler fixes

Solaris portability

solaris portability -- proper declarations

clarify setvendor()

portability for AIX

make proctitle padding adjustable

Solaris portability fixes

add argc & argv to init_md call to enhance extensibility

portability changes for MACH386

fix errno race condition

8.6.2: improved error return messages; better error handling on
hung connections or the name server is down; add "vendor code" on V line;
fix some X-Authentication-Warning: problems; portability fixes

8.6.1: A/UX and Encore UMAX V patches; fix to not toss error messages
too early

re-enable Return-Receipt-To:

hooks for future features

compile cleanup on various systems (mostly AUX)

get sendmail.cf name from a routine (so it can autoconfigure on NeXt)

NeXT portability changes; cleanup of <sys/wait.h> assumptions

allocate trace flag to checkcompat()

fix syntax problem

AUX compatibility