set(SRCROOT ${PROJECT_SOURCE_DIR}/examples/X11) # all source files set(SRC ${SRCROOT}/X11.cpp) # find OpenGL and X11 find_package(OpenGL REQUIRED) include_directories(${OPENGL_INCLUDE_DIR}) find_package(X11 REQUIRED) include_directories(${X11_INCLUDE_DIR}) # define the X11 target sfml_add_example(X11 GUI_APP SOURCES ${SRC} DEPENDS sfml-window sfml-system ${OPENGL_LIBRARIES} ${X11_LIBRARIES})