title: How to specify Boost location for CMake in Visual Studio 2017
body: <p>I'm trying to use CMake in Visual Studio 2017 but it's not finding Boost. I think this is normal but previously I'd use CMake GUI to specify BOOST_ROOT. Where can I specify the location in Visual Studio 2017 without editing the CMake files themselves (which are stored in source control so shouldn't be edited)?</p>