title: How to specify additional include directories for msbuild.exe
body: <p>I am attempting to install the nodejs module ibm_db. The issue I am having is that in order to install this module node-gyp needs to build it using msbuild, but it won't detect some header files I have installed.</p>
  
  <p>How do I add the directory of my additional header files to some path so hatt msbuild.exe will find them when trying to compile any project? On linux I simply set cpath= and everything build just fine.</p>
  
  <p>Thanks!</p>