Build img filed at build busybox

[童虎]

I have also ask a question on stackoverflow: https://stackoverflow.com/questions/50943890/make-busybox-failed-when-make-aosp

The question is: 

I want make android aosp, but I failed at make busybox:
The log is https://gist.github.com/huhuang03/1a74b57d08860dc8f5b28c43bdb07272
My env: xcode9.0, command line tools: xcode8.3.3, macos: 10.13.4, macos sdk: 10.13.
And the file /Volumes/android/source/android-x86/external/busybox/Makefile is https://gist.github.com/huhuang03/8a52bf3a5aaffffdd5cfdbc287ef42f2
And file scripts/Makefile.host: https://gist.github.com/huhuang03/419e55ac65276e87b27ec46031fdc243
I didn't know what to do now. It seems that no error info in the error log.