+if(QT_USES_X11)
+ find_package(X11 REQUIRED)
+ target_link_libraries(${_lyx} ${X11_X11_LIB}) # we need it because we use XSendEvent
+ if(HAVE_QT5_X11_EXTRAS)
+ find_library(XCB_LIBRARY NAMES xcb)
+ if (XCB_LIBRARY MATCHES "NOTFOUND")
+ message(FATAL_ERROR "Need xcb library to use with QT5_X11_EXTRAS")
+ endif()
+ target_link_libraries(${_lyx} ${LYX_QT5_X11_EXTRAS_LIBRARY} ${XCB_LIBRARY})
+ endif()
+endif()
+