The new Release 20.03 is out! You can download binaries for Windows and many major Linux distros here .
the messages is issued since the path of the compiler is not found. Please set the correct path of your compiler in the Settings->Compiler and Debugger and choose tab: Toolchain executables.
Luckily recent revisions of C::B tell exactly this in the warning message. Seems it was a good thing to do... This question is raised round about 1 million times now. And searching the forums seems to be impossible for quite forum users. :?
I hope C::B can set the build path automatically in the next version.
Well... if you tell me how to do that we can implement it. That is impossible to know! The compiler setup has to be done by a user that really knows. There is no voodoo we can apply. Sorry.