title: ubuntu 15.10 64bit build Android source 5.0 version
body: <p>How can I fix this problem？When I was building the Android source of 5.0 with 
  'make -j4', it was causing a problem.
  This is the error log:</p>
  
  <pre><code>Install: out/host/linux-x86/bin/acp
  Yacc: aidl &lt;= frameworks/base/tools/aidl/aidl_language_y.y
  prebuilts/misc/linux-x86/bison/bison -d  -o out/host/linux-x86/obj32/EXECUTABLES/aidl_intermediates/aidl_language_y.cpp frameworks/base/tools/aidl/aidl_language_y.y
  Lex: aidl &lt;= frameworks/base/tools/aidl/aidl_language_l.l
  logtags: out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/src/core/java/android/content/EventLogTags.java &lt;= frameworks/base/core/java/android/content/EventLogTags.logtags
  prebuilts/misc/linux-x86/bison/bison: m4 子进程失败
  build/core/binary.mk:539: recipe for target 'out/host/linux-x86/obj32/EXECUTABLES/aidl_intermediates/aidl_language_y.cpp' failed
  make: *** [out/host/linux-x86/obj32/EXECUTABLES/aidl_intermediates/aidl_language_y.cpp] Error 1
  make: *** 正在等待未完成的任务....
  frameworks/base/tools/aidl/aidl_language_l.l:55: warning, 无法匹配规则
  flex-2.5.39: fatal internal error, exec of /usr/bin/m4 failed
  build/core/binary.mk:576: recipe for target 'out/host/linux-x86/obj32/EXECUTABLES/aidl_intermediates/aidl_language_l.cpp' failed
  make: *** [out/host/linux-x86/obj32/EXECUTABLES/aidl_intermediates/aidl_language_l.cpp] Error 1
  make: *** Deleting file 'out/host/linux-x86/obj32/EXECUTABLES/aidl_intermediates/aidl_language_l.cpp'
  logtags: out/target/common/obj/JAVA_LIBRARIES/framework_intermediates/src/core/java/android/speech/tts/EventLogTags.java &lt;= frameworks/base/core/java/android/speech/tts/EventLogTags.logtags
  </code></pre>