How do I fix this error: "Library not loaded: /usr/X11R6/lib/libX11.6.dylib"?
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Library not loaded: /usr/X11R6/lib/libX11.6.dylib
If you get this error in the Pd window when starting Gem, PDP, or Pd-extended, then that means that you are missing X11. (This happens almost exclusively on Mac OS X since GNU/Linux almost always includes it by default.)
To fix this, install X11: How do I install Pd on MacOS X?