The answer is a bit complicated. The last released SDK is for devices with firmware version 5. The 626 uses firmware version 4, so you need to use the older SDK 1.1a (
http://sourceforge.net/projects/pock...SDK_Linux_1.1/.
However, that SDK was released in 2011, and some things changed since then in firmware version 4. Support for multi-touch events was added after, and the configuration data structure got a new member added. If you don't want to access the stuff that changed, then you can just use SDK 1.1a. If you do, you'll have to hack things. You can either update the main inkview.h header file in the old SDK with the new stuff (using the header file in the latest SDK), or you can hack your application code to work around the changes (as I did in pbimageviewer.app).