How to build syncthing for Android (Android Studio in Windows)

I installed python 2.7 So, we have the following :

Boris@Main ~ $ cd /cygdrive/w/Android_Projects

Boris@Main /cygdrive/w/Android_Projects $ ./test_5

Starting build for arm

Building standalone NDK

HOST_OS=cygwin

HOST_EXE=.exe

HOST_ARCH=x86_64

HOST_TAG=windows-x86_64

HOST_NUM_CPUS=8

BUILD_NUM_CPUS=16

ERROR: Failed to create toolchain.

What is the way to fix the error?