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From what I've seen, the existing C++ libraries in ROS that expose QT widgets don't do anything special to expose the MOC'd files that are generated from headers.
Between reading the qt_gui_cpp CMakeLists.txt and some MOC documentation it looks like MOC creates C++ implementation files only (My interpretation of the documentation is that MOC does not generate header files). These generated C++ files are then compiled into a library within the source project. Downstream projects then include the original headers and link against the compiled library.
In your case, you'd want to make sure that the ${PROJECT_NAME} library contains both your source and the MOC-generated files.
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