Plugin wont compile - run keepass as administrator or root on linux.
Just a small Gotcha not mentioned above or in any of the documentation for KeePassRPC is that (at least on Mint linux) you need to run keepass with root credentials for it to compile plugins!!! That seems like an obvious oversight and should be top of the trouble shooting list!!!
Hope this at least saves others 2 days of checking all the other things that can go wrong (versions etc) or consider updating the error message to be more meaningful perhaps?