gem-extra 1:0.93.3-9build1 (amd64 binary) in ubuntu xenial

 Gem is a loadable library for Pure Data (Pd), which adds OpenGL graphics
 rendering and animation to Pd. Pd is a graphical programming language and
 computer music system.
 .
 This package includes some contrib objects, mainly for tracking.
 Currently included objects are:
 [pix_mano], [pix_drum] tracking objects by Jaime Oliver
 [pix_fiducialtrack] reacTIVision-like tracking