Most versions of Unix compilers provide environment variables to
programs in the third argument to main( ).
Others provide environment variables in an external pointer-variable
called environ. If yours uses this latter
approach, you can take advantage of it by defining this USE_ENVIRON
compile-time macro:
APPENDDEF(`confENVDEF', `-DUSE_ENVIRON=1') 
available with V8.12 and above
See Section 10.2 for a discussion of
sendmail and the environment.
If you are running a precompiled sendmail
binary, you can use the -d0.10 debugging
command-line switch (-d0.10) to determine if
USE_ENVIRON support is defined (if it appears in the list, it is
defined).
