Including an external library in Visual Studio 2010 project

I'm new to visual studio and can't seem to find an answer to this a开发者_如何转开发nywhere.

I'm working on a project in VC++ with VS2010. I have another project that builds into a .lib file set up as a reference, but can't figure out how to actually include the headers. Google has proved useless. Please help!

Generally this is done by adding the directory where the include files live to the project's "Additional Include Directories" property (in the "C/C++ | General" property page).

Note that the location can be a relative path if the different projects will always be at the same file system level relative to one another, or they can use VS macros or environment variables.