How do you set a relative path for a file-based package source with NuGet?

It looks like this is now supported.

http://nuget.codeplex.com/workitem/2810

1. Put a file called nuget.config in the root of your solution (next to packages folder and solution file) containing:

   <?xml version="1.0" encoding="utf-8"?>
   <configuration>
     <packageSources>
       <add key="Local" value="packages-local" />
     </packageSources>
   </configuration>
   

2. Build you packages to the packages-local folder.

3. The packages in this folder will be available to add to other projects in the solution. (You may need to restart VS or at least close-reopen your solution for the config to be picked up).