if (EXISTS ${CMAKE_SOURCE_DIR}/lib/WinToast/src/wintoastlib.cpp) set(WinToast_FOUND TRUE) add_library(WinToast ${CMAKE_SOURCE_DIR}/lib/WinToast/src/wintoastlib.cpp) target_include_directories(WinToast PUBLIC "${CMAKE_SOURCE_DIR}/lib/WinToast/src/") else () set(WinToast_FOUND FALSE) message("WinToast submodule not found!") endif ()