c++ - Cross-Compiling xnu for 5s -

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whilst trying build cross toolchain i've come across error trying compile xnu ios:

$ make sdkroot=iphoneos target_configs=armv7a xcrun: error: unable find utility "embedded_device_map", not developer tool or in path     xcrun: error: unable find utility "embedded_device_map", not developer tool or in path /usr/local/src/xnu/makedefs/makeinc.kernel:14: *** unsupported current_arch_config .  stop. make[1]: *** [build_setup_bootstrap_armv7a^^] error 2 make: *** [all] error 2

i cannot find information on tool @ all, let alone methods install or cross compile cortex-a9 (apple a5)

thus, i'd ever grateful if provide hint of insight. on earth can find tool?


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