C ++ / CLI and Entity Framework 5

I thought I'd try using EF 5 with C ++ / CLI in VS2012 so that I can try Code First. Loading the package via NuGet is fine, but doesn't show up in the solution.

Upon examination, the package manager says the package is incompatible with the Framework version used by the solution and requires 4.0 or 4.5 ... but the configuration for the project (a normal Win32 console application) says it is using v4.5.

Has anyone come across this and found a way to fix it?