How to set relative paths in VS2010

I've just found some source on the web and want to compile it. When I open the project and look for the relative paths of the files it writes

$(ZLibSrcDir)\adler32.c

where do I set the ZLibSrcDir at Visual Studio 2010? For somehow it is trying to look at some wrong path.

Th开发者_如何转开发anks in advance

You can set user macros in the Property Manager. Right click a property sheet and open the properties dialog, and there's a section called User Macros. There might already be a macro called ZLibSrcDir, or you might have to create a new property sheet to be able to add it.

You can create an environment variable called ZLibSrcDir, direct it to the correct directory, restart Visual Studio and you're ready to go.