i build android ROM for nanopi 2 fire, but it missing function Register_librecovery_updater_nanopi2().
Please help me. how to fix it.

Message here:
target Symbolic: libion-nexell (out/target/product/nanopi2/symbols/system/lib/libion-nexell.so)
target Symbolic: libv4l2-nexell (out/target/product/nanopi2/symbols/system/lib/libv4l2-nexell.so)
target Symbolic: lights.nanopi2 (out/target/product/nanopi2/symbols/system/lib/hw/lights.nanopi2.so)
out/target/product/nanopi2/obj/PACKAGING/updater_extensions_intermediates/register.inc:4: error: undefined reference to 'Register_librecovery_updater_nanopi2'
collect2: error: ld returned 1 exit status
build/core/executable_internal.mk:66: recipe for target 'out/target/product/nanopi2/obj/EXECUTABLES/updater_intermediates/LINKED/updater' failed
make: *** [out/target/product/nanopi2/obj/EXECUTABLES/updater_intermediates/LINKED/updater] Error 1
make: *** Waiting for unfinished jobs....