The Makefile for building the sources depends on an ancient SDK that is no longer available. I've been hacking the official SDKs ever since to fit within the old make system, since I much prefer it to the newer cmake based system, but I don't expect anyone else to go to such lengths. Long story short, if you want to build the code yourself, you will have to produce cmake files for it to work with the SDK you download from PocketBook. That's probably very easy for someone familiar with cmake, but it is a chore for someone like me who always stuck with make.
I believe that you would need a 64-bit linux environment to use the PocketBook SDK. I don't see any Windows executables in the compiler toolchain that they provide. I'm sure that installing something like 64-bit ubuntu into a VirtualBox image would work fine if you have to work from a Windows machine.
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