Can't install NDK using cygwin how to fix?

Welcome! Enter in the Cygwin Terminal: "/cygdrive/C/NDK/ndk-build" appears the following: -bash: /cygdrive/C/NDK/ndk-build: No such file or directory
Tried differently:
$ /cygdrive/C/NDK/build/ndk-build
Android NDK: Could not find application project directory !
Android NDK: Please define the NDK_PROJECT_PATH variable to point to it.
/cygdrive/C/NDK/build/core/ *** Android NDK: Aborting . On mills.
How to fix tell me?
July 8th 19 at 16:29

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