[CMake] CMAKE_MFC_FLAG is inherited in subdirectory ?

[elizabeta petreska]

Hello
I have one cmakelists in which I do the following :
set(CMAKE_MFC_FLAG 2)

In the same cmakelists I am using add_subdirectory to add another project ,
and this makes my added directory with sub_directory to have
set CMAKE_MFC_FLAG too ,which is not the behaviour I want .
How to avoid this ?
Thanks
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