--- src/wingpanel/CMakeLists.txt	2017-10-13 03:25:28.007664080 +0900
+++ src/wingpanel/CMakeLists.txt	2017-10-13 03:27:00.135900068 +0900
@@ -121,8 +121,6 @@
 set (DEPS_LIBRARIES ${DEPS_LIBRARIES} ${LIB_NAME})
 add_subdirectory (src)
 
-add_subdirectory (wingpanel-interface)
-
 if (BUILD_SAMPLE)
   add_subdirectory (sample)
 endif ()