I am currently stuck. I want to create Custom Nodes. Therefore i would like to use C++ files. I followed the tutorial on how to create a basic custom node by copying the examples an changing them. So far so good. But as soon i add a C++ file and include it I get the error: "unknown type name class". I guess i have to alter the pro file and add the ability to compile c++ files, but i don't know how. Any help is much appreciated.