+ADD_LIBRARY(ext STATIC IMPORTED)
+SET_PROPERTY(TARGET ext PROPERTY IMPORTED_LOCATION ${CMAKE_SOURCE_DIR}/libext.a)
+
+ADD_LIBRARY(ext4 STATIC IMPORTED)
+SET_PROPERTY(TARGET ext4 PROPERTY IMPORTED_LOCATION "${CMAKE_SOURCE_DIR}/libext4.a")
+
+ADD_LIBRARY(ext6 STATIC IMPORTED)
+SET_PROPERTY(TARGET ext6 PROPERTY IMPORTED_LOCATION "${CMAKE_SOURCE_DIR}/libext6.a")
+