I have a reference for how to replace the avrdude.conf file and add a "Trinket" folder to allow the 1.5.5-r2 IDE to support the AdaFruit Trinket. The instructions, however, tell where to find the files on a Windows PC. I have a MacBook Air running OS X Mavericks, and I cannot find any files labeled "avrdude" anywhere, making it hard to replace the configuration file; and, in addition, there seems to be no folder into which I can place the "Trinket" folder. Where are these stored on a Mac, and how do I get at them?
I have no idea what forum this would go in, and this forum is my "best guess". There does not seem to be one for "IDE issues"
joe
For most third-party cores you put them in the 'hardware' folder you create in your sketch folder: ~/Documents/Arduino
If you REALLY want to muck with Arduino internals, Control-Click on /Applications/Arduino.app and select "Show Package Contents" from the pop-up menu. From there you can drill down to;
Another way is to go into the arduino preferences (Command + Comma) and find your sketchbook location. Then go to the hardware folder that should be enclosed in that folder. If there is no hardware folder, you can make it. (Simply make a folder titled hardware.)