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Notes for anyone wanting to build Debian packages of p7zip.
-----------------------------------------------------------

 - 7z is the full featured command line version of 7-Zip. 7z uses other
   modules from 7-Zip package. 7za is a standalone command line version
   of 7-Zip. 7za supports only 7z, zip, gzip, bzip2 and tar formats. 7za
   doesn't use other modules. Modules are in /usr/lib/p7zip.

 - These packages of p7zip (source and binary) do not contain the RAR
   decoder which is released under the terms of the UnRAR license (which
   is non-free). A non-free so file is provided in the non-free package
   p7zip-rar available at http://adn.diwi.org/debian/p7zip-rar (should be
   up-to-date).

Note concerning directory exclusion.
------------------------------------

 - Directory exclusion only works when an exclude list file is provided
   and if directories to exclude are listed as relative paths of the
   location 7z or 7za is run from.

 - Using absolute directories *won't* work, as noted in #296665.