Google has never been so unhelpful, which is to say, he helped me only at the fourth or fifth entry.
This post includes a gem:
To debug the build issue, open the xml file in the Fakes folder added automatically to your project. Add the two parameters Diagnostic=”true” Verbosity=”Noisy” to the fake element, like this:(...)
Then in Tools|Options under Projects and Solutions|Build and Run, change the MSBuild project output verbosity to ‘Diagnostic’. Build again and in the generated output, look for Task “GenerateFakes”
It worked like a charm. Thanks David!