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