VS2015 issues

Two questions for VS2015 and my project (FYI, I’m using an editor built from the git source):

  1. How do I get Intellisense to work properly? Intellisense has red marked just about everything in my project as being undefined. It compiles fine, but Intellisense doesn’t seem to know where the header files are.

  2. How do I rebuild my project (just the project only) without VS rebuilding the entire **** engine every time? (Very annoying.)