Hij Bjoern, I finally got around to trying your suggestions. It worked out nicely, so thanks for that! I've added the modules as an example to the toolshed, as I didn't find an example yet. Three modules (threads, threads::shared and Thread::Queue) are bundled in a dependency definition called package_perl_threading. Best, Geert ________________________________________ Van: Geert Vandeweyer [geert.vandeweyer2@ua.ac.be] Verzonden: donderdag 8 augustus 2013 9:17 Aan: galaxy-dev@lists.bx.psu.edu Onderwerp: shed tool dependencies Hi, Is there a default notation to specify perl modules (threading modules) in a tool configuration or in a submission to the toolshed? I've got some tools to share that make extensive use of these modules, and they are not default in a perl distribution. Hence, I'd like to inform the users that they need to install these modules (or that they get installed by the the toolshed using cpan ?) Best, Geert -- Geert Vandeweyer, Ph.D. Department of Medical Genetics University of Antwerp Prins Boudewijnlaan 43 2650 Edegem Belgium Tel: +32 (0)3 275 97 56 E-mail: geert.vandeweyer@ua.ac.be http://ua.ac.be/cognitivegenetics http://www.linkedin.com/pub/geert-vandeweyer/26/457/726