$ pd -lib /usr/lib/pd/extra/Gem.pd_linux couldn't open MIDI input device 0 couldn't open MIDI output device 0 opened 0 MIDI input device(s) and 0 MIDI output device(s). /usr/lib/pd/extra/Gem.pd_linux: can't load library
try: pd -lib gem (or Gem)
add -path <library path> if nescessary
see also: http://www.crca.ucsd.edu/~msp/Pd_documentation/x3.htm#s4