Fix compile error introduced with d6b3f698

I should be more careful when reordering commits in my local branches :-)

libkwineffects/CMakeLists.txt

@@ -39,7 +39,7 @@ macro( KWIN4_ADD_GLUTILS_BACKEND name glinclude )
         include_directories(${OPENGLES_EGL_INCLUDE_DIR})
     endif(OPENGL_EGL_FOUND)
     kde4_add_library(${name} SHARED ${kwin_GLUTILSLIB_SRCS})
-    target_link_libraries(${name} ${KDE4_KDEUI_LIBS} ${QT_QTGUI_LIBRARY} ${X11_LIBRARIES} kwineffects)
+    target_link_libraries(${name} ${KDE4_KDEUI_LIBS} ${QT_QTGUI_LIBRARY} ${X11_LIBRARIES} ${XCB_XCB_LIBRARIES} ${X11_XCB_LIBRARIES} kwineffects)
     if(OPENGL_EGL_FOUND)
         target_link_libraries(${name} ${OPENGLES_EGL_LIBRARY})
     endif(OPENGL_EGL_FOUND)