The Makefile for this project depends on Sergey Vlasov's pocketbook SDK
being installed on the system.  However, that SDK is no longer being updated
or even distributed.  So @brucelee has provided some cmake-based tools for
building pbimageviewer using his SDK (which can be found at:
https://github.com/blchinezu/pocketbook-sdk).  He even added the extra
include files and libraries required to build pbimageviewer to his SDK.

Here are his instructions for building:

Build:
- place the PBDEV sdk dir in your home ~/
- place the pbimageviewer-src dir in ~/PBDEV/sources/
- cd ~/PBDEV/sources/pbimageviewer-src/
- bash make.sh BUILD-TYPE

BUILD-TYPE can be any of: 360, fw2, fw4, fw5
If none is given then all of them will be built.


Note that the cross-compilers are 32-bit, so you need the 32-bit compatibility
libraries installed if you are running on a 64-bit system.
