cannot use iconv/icu to build boost::locale

I tried use this project to generate icon/icu libs for android. but when I tried to set it as back-end of boost::locale, it fails. seems boost not find icu/icon libs. how can I use these libs.
I add boost build flag like this 
list(APPEND BOOST_FLAGS boost.locale.icu=on -sICU_PATH=MY_PATH/libiconv-libicu-android-master/armeabi) in cmake
