在执行$NDK-build时，如果出现错误：
NDK\prebuilt\windows\bin\awk.exe: can't open file /cygdrive/d/NDK/build/awk/check-awk.awk
source line number 1 source file /cygdrive/d/NDK/build/awk/check-awk.awk
context is
>>> <<<
Android NDK: Host 'awk' tool is outdated. Please define HOST_AWK to point to Gawk or Nawk !
/cygdrive/d/NDK/build/core/init.mk:258: *** Android NDK: Aborting. . Stop.
解决方法：
找到 \NDK目录\prebuilt\windows\bin\awk.exe，把awk.exe删除或改名，之后编译通过。