set(SRCROOT ${PROJECT_SOURCE_DIR}/examples/X11) # all source files set(SRC ${SRCROOT}/X11.cpp) # define the X11 target sfml_add_example(X11Example GUI_APP SOURCES ${SRC} DEPENDS SFML::Window X11) # external dependency headers target_include_directories(X11Example SYSTEM PRIVATE ${PROJECT_SOURCE_DIR}/examples/X11)