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I simply needed to add my new "HDR" macro to the add_library function!

in total:

set(HDR_FILES
    include/heika_panel_beta/heika_panel_beta.h
)

set(SRC_FILES
  src/heika_panel_beta.cpp
)

add_library(${PROJECT_NAME} ${SRC_FILES} ${HDR_FILES})

Works now! Thanks to everyone!

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