title: Setting environment variables for build in Visual Studio (2008)
body: <p>I looked at some projects generated by the Qt plugin for VS and noticed that they use the environment variable QTDIR to refer for example to the Qt header files. However I failed to figure out where this variable is set. I guess it must be somewhere in the project settings, however I could not find it. Also please note that I am referring to the environment variables required during the build, not the ones for debugging.</p>