Android 9 编译exec of /usr/bin/m4 failed

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Android 9编译报错:

1. [  0% 1/121141] Lex: dtc <= external/dtc/dtc-lexer.l
   
2. FAILED: out/host/linux-x86/obj/EXECUTABLES/dtc_intermediates/dtc-lexer.c
   
3. /bin/bash -c "prebuilts/misc/linux-x86/flex/flex-2.5.39 -oout/host/linux-x86/obj/EXECUTABLES/dtc_intermediates/dtc-lexer.c external/dtc/dtc-lexer.l"
   
4. flex-2.5.39：严重内部错误，exec of /usr/bin/m4 failed

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解决方案：

1. sudo apt-get install m4
   
2. sudo apt-get install libxml2-utils

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