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Eventually I solved it. It appears that the contents of my message were not valid: I used the type Int32 instead of int32. This became clear to me when I removed all references to the non-existent header, built it and looked very closely at the build output in QtCreator.

Because of the wrong type used, it gave a very non-descriptive error, telling me that Gui/msg/Int32.msg was not found (the message name was Gui/msg/rect.msg).