How to install:

 0. Put the checkpam directory into SimplePAMApps/apps and
 		add checkpam to apps/Makefile
 1. Compile the checkpam program:
       # { cd ../../../; make }
 2. Install the checkpam program:
       # cp checkpam /bin/checkpam
       # chmod 700 /bin/checkpam

 Note that if the first argument to checkpam (after the program it is
 to execute) is `Maildir', then if $MAILDIR is `.' after PAM (due normally
 to the set_maildir option in pam_checkpassword.so), this argument will
 be overwritten. It is likely this will be changed to detect the string
 `$MAILDIR' and replace it with that envvar.