A common issue people run into is that they don't build libsigrokcxx since they're missing some dependencies, and later on PV fails at the cmake step since it doesn't find libsigrokcxx.

This is not a problem per se, but since nobody ever reads the documentation and instead asks on ML or IRC or random forums why PulseView doesn't build, maybe we should have cmake emit a "libsigrokcxx missing, you probably didn't build it or were missing some dependencies" warning in case libsigrokcxx is not found.