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基于arkguard做二次开发，如何编译arkguard工程？
目前按照https://gitee.com/openharmony/arkcompiler_ets_frontend/tree/master/arkguard 配置gn、ninja等编译环境，存在编译问题：

ERROR at //arkcompiler/toolchain/build/toolchain/toolchain. gni:57:5: Undefined identifierl 
if (is_mac) { 
  See //arkcompiler/toolchain/build/ark. gni:18:1: whence it was imported. 
  import("$build_root/toolchain/toolchain. gni") 
  See //arkcompiler/ets_frontend/ets_frontend_config.gni:24:3: whence it was inported.import(“Sbuild_root/ark.gni”) 
  See //arkcompiler/toolchain/build/core/gn/BUILD. gn:14:1: whence it was imported. 
  inport("//arkcompiler/ets_frontend/ets_frontend_config.gni")