The Arduino IDE is a software package that allows you to write programs for Arduino and compatible boards.
In order to make programming easier, one can add a library to the Arduino IDE so that useful function calls are available for performing certain tasks.
The Handheld Video Game Mark IV includes a TFT display with an ILI9341 controller. The PDQ graphic library provides functions that allow one to easily draw images on the display. Adding libraries to the Arduino IDE isn't always straightforward. Here are the steps to add the library at the time of this writing.
1. Download the PDQ library from this page.
2. Extract the contents of the zip file.
3. Copy the directories PDQ_GFX and PDQ_ILI9341 under the directory user/Arduino/libraries.
4. Start up the Arduino IDE and the new libraries should be recognized.