Hi, In MediaWiki 1.25 we've changed the way we manage external dependencies on PHP libraries. In the past the libraries would just be copied into our git repo, but we're now using composer[1] to manage these dependencies. We plan[2] on including these dependencies inside the tarball, they'll all be located inside the "vendor" directory. Currently the following dependencies have been added: * leafo/lessphp[3]: a less compiler (formerly bundled inside MediaWiki) * psr/log[4]: Common interfaces for logging * cssjanus/cssjanus[5]: Flips CSS for RTL languages (formerly bundled inside MediaWiki) * wikimedia/cdb[6]: Provides CDB fallback in pure PHP (formerly part of MediaWiki) * oojs/oojs-ui[7]: Library of widgets, layouts, and windows 1.25 is still in development, so it's possible that the list of dependencies will change over the next few months. The current set of dependencies can be found in our composer.json file[8] and on-wiki[9]. MediaWiki expects that there will be an autoloader at "vendor/autoload.php" which will load these libraries. Please let me know if you have any questions, or if we can do anything to help out making packaging easier. Thanks, -- Legoktm [1] https://getcomposer.org/ [2] https://phabricator.wikimedia.org/T74726 [3] http://leafo.net/lessphp/ [4] http://www.php-fig.org/psr/psr-3/ [5] https://github.com/cssjanus/php-cssjanus [6] https://www.mediawiki.org/wiki/CDB [7] https://www.mediawiki.org/wiki/OOjs_UI [8] https://github.com/wikimedia/mediawiki/blob/master/composer.json [9] https://www.mediawiki.org/wiki/MediaWiki_1.25#External_libraries