title: MSYS2: is a windows or unix environment?
body: <p>I'm confused about the environment. Using MSYS2 under Windows, I want to compile, say, the boost library:</p>
  
  <p><a href="http://www.boost.org/users/history/version_1_64_0.html" rel="nofollow noreferrer">http://www.boost.org/users/history/version_1_64_0.html</a></p>
  
  <p>What file I have to download? The one for Windows or the one for unix?</p>