---with-hesiod=PREFIX
- Specify the location of Hesiod.
-
---with-krb4=PREFIX
- Specify the location of Kerberos V4 for KPOP support. You will also need
- to specify the option `--enable-nmh-pop'. After running configure, you
- will need to change the POPSERVICE #define in config.h if you want to use
- KPOP exclusively (rather than being able to switch between KPOP and normal
- POP3). See the comments inside config.h for details.
+--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.