option(LWEXT4_BUILD_SHARED_LIB "Build shared library" OFF) #LIBRARYinclude_directories(.)aux_source_directory(. LWEXT4_SRC)if(LWEXT4_BUILD_SHARED_LIB)  add_library(lwext4 SHARED ${LWEXT4_SRC})else()  add_library(lwext4 STATIC ${LWEXT4_SRC})endif() if  (DEFINED SIZE)    add_custom_target(lib_size ALL DEPENDS lwext4 COMMAND ${SIZE} liblwext4.a)else() endif() if  (DEFINED INSTALL_LIB)INSTALL(TARGETS lwext4 DESTINATION /usr/local/lib)INSTALL(DIRECTORY ${PROJECT_BINARY_DIR}/include/. DESTINATION /usr/local/include/lwext4)endif()