After successfully installing RQuantLib from sources, I went to run its demos 
and got a fatal "beachball". 

Tried running R from Terminal with R --vanilla

The demos() panel says that rgl is required and that seemed not to be a 
difficulty since I had used it many times in the past.

Tried loading rgl ... beachball.

Tried reinstalling XQuartz (and restarting Mac)

Tried Launching XQuartz and got an apple  error saying:


dyld: Symbol not found: __cg_jpeg_resync_to_restart
      Referenced from: 
/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libTIFF.dylib
      Expected in: /usr/local/lib/libJPEG.dylib

So searched on the error message and tried this fix from 
https://gist.github.com/leonardoborges/2549670


sudo cp 
/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Resources/libJPEG.dylib
 /usr/local/lib/libJPEG.dylib


Voila! No further difficulties.

-- 
David Winsemius
Alameda, CA, USA

'Any technology distinguishable from magic is insufficiently advanced.'   
-Gehm's Corollary to Clarke's Third Law

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