You may wanna try reinstalling Cygwin and Make, as it looks like something is misconfigured in your currently installation.

hi there~ thank u for helping..
but.. yea~ i did it before install NDK

Hi, have you also installed "make" with cygwin ? This could be a possible cause;

you may want to double check the installation instructions for cygwin at: https://ar.qualcomm.at/

(See Getting Started section => setting up the development environment).