title: Boost - Cannot open include file: 'ctype.h'
body: <p>I'm installing Boost 1.57.0 through the VS 2015 CTP6 Command Prompt, and I'm at the Boost.Build compile stage, but I get many of the below errors when running <code>tools\build\bootstrap.bat</code>:</p>
  
  <pre><code>e:\boost_1_57_0\tools\build\src\engine\jam.h(34): fatal error C1083: Cannot open include file: 'ctype.h': No such file or directory
  </code></pre>