Installation instructions:

Unzip this package in the directory of your choice (I would suggest
/usr/local/ifile/) and then run the install script (if you do not have perl
installed in /usr/bin, you will need to edit 'install.perl' and change the
first line to the proper directory).

The script will search for certain binaries, prompting you if it cannot find
them.  If you are prompted and aren't sure of their location, stop the
installation (Ctrl-C) and take the time to find them.

Once it has the directory information, it will backup the current mh refile
program and replace it with a link to irefile.  It will
also add two lines to your .maildelivery file (creating it if necessary) 
which will have slocal run the ifilter program.

Finally, once the script has finished, you must change the
"Incorporate Mail -> Ways to Inc" option within EXMH to "presort".

Read the README file for more information.