[CMake] .h file preprocessor definition

[Alex H]

If I have a .h file and I want to create a library using that .h file and some other file, how can I set the preprocessor definition to some FLAG?
So far I think the way to go is the following:
set_source_files_properties(vehicle.h PROPERTIES COMPILE_FLAGS "-DPROJECT")
is this right? I tried it and it doesn't work 		 	   		  
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