+ eqn ../doc/op.me | pic | ditroff -me
+
+The Makefile is for the new Berkeley make, available from ftp.uu.net
+in the directory /systems/unix/bsd-sources/usr.bin/make. There is
+also a Makefile.dist which is much less clever, but works on the old
+traditional make. You can use this using:
+
+ make -f Makefile.dist
+
+There are a couple of other Makefiles for other systems -- these are
+the ones that I use, they have "Berkeley quirks" in them, and I don't
+guarantee that they will work in your environment. To make it worse,
+some are for the new Berkeley make, and some are for the old make.
+I provide them for information only. Still, they may help you get
+started. They have names like "Makefile.HPUX".
+
+Whereever possible, I try to make sendmail pull in the correct
+compilation options needed to compile on various environments based on
+automatically defined symbols. Some machines don't seem to have useful
+symbols availble, requiring the following compilation flags in the
+Makefile:
+
+SOLARIS Define this if you are running Solaris 2.0 or higher.
+NeXT Define this if you are on a NeXT box.
+_AIX3 Define this if you are IBM AIX 3.x.
+
+If you are a system that sendmail has already been ported to, you
+probably won't have to touch these. But if you are porting, you may
+have to tweak the following compilation flags in order to get
+it to compile and link properly:
+
+UNSETENV Define this if your system library does NOT include the
+ "unsetenv" subroutine.
+SYSTEM5 Adjust for System V.
+LOCKF Set this if you do not have the flock system call -- it
+ will revert to System V file locking. There are some
+ semantic gotchas, so flock is preferred. Implied by
+ SYSTEM5.
+SYS5TZ Use System V-style time zones. If not set, the TZ
+ environment variable is ignored. Implied by SYSTEM5.
+HASUNAME Set if you have the "uname" system call. Implied by
+ SYSTEM5.
+HASSTATFS Define this if you have the statfs(2) system call. It's
+ not a disaster to get this wrong -- but you do lose the
+ queue free space code.
+HASUSTAT Define this if you have the ustat(2) system call. It's
+ not a disaster to get this wrong -- but you do lose the
+ queue free space code.
+HASSETSID Define this if you have the setsid(2) system call. This
+ is implied if your system appears to be POSIX compliant.
+HASINITGROUPS Define this if you have the initgroups(3) routine.
+LA_TYPE The type of load average your kernel supports. These
+ can be LA_SUBR (4) if you have the getloadavg(3) routine,
+ LA_FLOAT (3) if you read kmem and interpret the value
+ as a floating point number, LA_INT (2) to interpret as
+ an integer. These last two have several other parameters
+ that they try to divine: the name of your kernel, the name
+ of the variable in the kernel to examine, the number of
+ bits of precision in a fixed point load average, and so
+ forth. In desparation, use LA_ZERO -- it always returns
+ the load average as "zero" (and does so on all architectures).
+ The actual code is in conf.c -- it can be tweaked if you
+ are brave.
+
+There are a bunch of features that you can decide to compile in, such
+as selecting various database packages and special protocol support.
+Several are assumed based on other compilation flags -- if you want to
+"un-assume" something, you probably need to edit conf.h. Compilation
+flags that add support for special features include:
+
+NDBM Include support for "new" DBM library for aliases and maps.
+NEWDB Include support for Berkeley "db" package (hash & btree)
+ for aliases and maps.
+NIS Define this to get NIS (YP) support for aliases and maps.
+YPCOMPAT Define this to force building of DBM versions of alias
+ files even if you have NEWDB defined; this will only
+ occur on NIS master machines. It is independent of NIS.
+USERDB Include support for the User Information Database. Implied
+ by NEWDB conf.h.
+IDENTPROTO Define this to get IDENT (RFC 1413) protocol support.
+ This is assumed unless you are running on Ultrix or
+ HP-UX, both of which have a problem in the UDP
+ implementation.
+MIME Include support for MIME-encapsulated error messages.
+FROZENCONFIG Define this to get support for frozen configuration
+ files. Frozen configurations make sense if your I/O system
+ is fast relative to your processor. At this point this
+ is NOT recommended.
+LOG Set this to get syslog(3) support. Defined by default
+ in conf.h. You want this if at all possible.
+NETINET Set this to get TCP/IP support. Defined by default
+ in conf.h. You probably want this.
+NETISO Define this to get ISO networking support.
+SMTP Define this to get the SMTP code. Implied by NETINET
+ or NETISO.
+NAMED_BIND Define this to get DNS (name daemon) support, including
+ MX support. The specs you must use this if you run
+ SMTP. Defined by default in conf.h.
+QUEUE Define this to get queueing code. Implied by NETINET
+ or NETISO; required by SMTP. This gives you other good
+ stuff -- it should be on.
+DAEMON Define this to get general network support. Implied by
+ NETINET or NETISO. Defined by default in conf.h. You
+ almost certainly want it on.
+MATCHGECOS Permit fuzzy matching of user names against the full
+ name (GECOS) field in the /etc/passwd file. This should
+ probably be on, since you can disable it from the config
+ file if you want to. Defined by default in conf.h.
+SETPROCTITLE Try to set the string printed by "ps" to something
+ informative about what sendmail is doing. Defined by
+ default in conf.h.
+
+If you are compiling on SunOS and want to use frozen configuration
+files, you must use -Bstatic -- if you do not, frozen configuration
+files fail in bizarre ways and you will open up several security holes.
+
+If you are compiling on OSF/1 (DEC Alpha), you must use -lmld.
+
+If you use both -DNDBM and -DNEWDB, you must delete the module ndbm.o
+from libdb.a and delete the file "ndbm.h" from the files that get
+installed (that is, use the OLD ndbm.h, not the new ndbm.h). This
+compatibility module maps ndbm calls into DB calls, and breaks things
+rather badly.
+
+You probably want to look over the compilation options in conf.h
+before you compile. These are intended to be per-site information.
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