Error registering package in Visual Studio 11

We are adapting our Visual Studio plugin to the new version VS 2012 and we have the following problem:

when I try to register a visual studio package using regpkg in Visual Studio 11 RC, I get the following error:

regpkg.exe /root:Software\Microsoft\VisualStudio\11.0 /codebase myvspackage.dll
Could not load file or assembly 'Microsoft.VisualStudio.Shell, Version=2.0.0.0,
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The
system cannot find the file specified.

This worked fine with previous versions of Visual Studio. I'm working in a clean virtual machine that only has Visual Studio 2012 RC.

I've been surfing the web looking for a solution with no success.

If I just copy the Microsoft.VisualStudio.Shell.dll in my app location it works fine, but this dll is not redistributable, so... what's the right way of registering a package in Visual Studio 11?

Thanks in advance for your help,

Luis