Arm64 can't let ENABLE_ASSEMBLY=ON or make failed

[Zeko]

Ubuntu 16.04, Jetson TX2. x265_2.4 I know in the /source/common/pritimitives.cpp, there is a function setupAssemblyPrimitives(x265::EncoderPrimitives&, int) hasn't been defined, if I make this sentence as a comment, it will make successful, but the encoding process hasn't any asm accelerating.

[ 48%] Built target common
[ 78%] Built target encoder
[ 80%] Built target x265-shared
[ 81%] Built target x265-static
[ 83%] Linking CXX executable x265
libx265.so.116: undefined reference to `x265::setupAssemblyPrimitives (x265::EncoderPrimitives&, int)'
collect2: error: ld returned 1 exit status
CMakeFiles/cli.dir/build.make:329: recipe for target 'x265' failed
make[2]: [x265] Error 1
CMakeFiles/Makefile2:207: recipe for target 'CMakeFiles/cli.dir/all' failed
make[1]: [CMakeFiles/cli.dir/all] Error 2
Makefile:129: recipe for target 'all' failed
make: *** [all] Error 2