Re: Error messages seems to be faulty

If you just want to turn off the messages, disable the plugin:
Settings -> Configure Kdevelop -> Plugins -> Problem Reporter View

I've also had it show errors when there were none. I think in my case 
Clang and whatever parses the code is just not working properly 
(incompatible? times out? crashes?). Turn them off altogether if you 
don't need them.

I use make, so this may not apply to Cmake. I think there is Cmake 
support. For includes, have a look at Project -> Open Configuration

Best regards,

Simon