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Why do I need to install cygwin for development with Qualcomm Vuforia on Android ?

Why do I need to install cygwin for development with Qualcomm Vuforia on Android ? For running the NDK build ? Background: [url]https://developer.qualcomm.com/mobile-development/mobile-technologies/computer-vision-fastcv/setting-developer-environment[/url] I saw this [url]https://groups.google.com/forum/?fromgroups#!topic/android-ndk/zAjzy4PZtmw[/url] while trolling the QDevNet threads. I'm just asking out of curiosity. In-depth explanation welcomed.