+--with-locking=LOCKTYPE (DEFAULT is dot)
+ Specify the locking mechanism when attempting to "inc" or
+ "msgchk" a local mail spool. Valid options are "dot",
+ "fcntl", "flock", and "lockf". Of the four, dot-locking
+ requires no special kernel or filesystem support, and simply
+ creates a file called "FILE.lock" to indicate that "FILE" is
+ locked.
+
+ In order to be effective, you should contact the site
+ administrator to find out what locking mechanisms other
+ mail delivery and user programs respect. The most common
+ reason not to use dot-locking is if the mail spool directory
+ is not world- or user-writeable, and thus a lock file cannot
+ be created.
+
+--enable-lockdir=DIR (DEFAULT is disabled)
+ If dot locking is being used, store all dot-lock files in "DIR".
+ The default is to store them in the directory of the file being
+ locked.
+
+--with-mts=MTS (DEFAULT is smtp)
+ Specify the default mail transport system you want to use. The two
+ acceptable options are "smtp" (which is the default), and
+ "sendmail". This value will be put into the mts.conf file. You
+ may find it convenient to specify a value at configure-time,
+ however, so that each time nmh is reinstalled, the right value will
+ be there.
+
+ If you use "smtp", this will enable a direct SMTP (simple mail
+ transport protocol) interface in nmh. When sending mail, instead
+ of passing the message to the mail transport agent, `post' will
+ open a socket connection to the mail port on the machine specified
+ in the `mts.conf' file (default is localhost), and speak SMTP
+ directly.
+
+ If you use "sendmail", then `post' will send messages by forking a
+ local copy of sendmail. Currently it will still speak SMTP with
+ this local copy of sendmail.
+
+ If you wish to use a transport agent other than sendmail, you will
+ need to use a `sendmail wrapper'.
+
+--with-ndbm=LIB (DEFAULT is to autodetect)
+--with-ndbmheader=HEADER (DEFAULT is to autodetect)
+ Specify the header file (eg ndbm.h) and library (eg ndbm) to use
+ to compile against the ndbm database library. By default, configure
+ will try various possibilities until it finds one that works; this
+ option only needs to be specified if the autodetection fails or
+ makes the wrong choice.
+
+ If either of these options is given then the other must also be
+ specified.
+