[IronPython] how to "target" .NET 4.0?

[Ken MacDonald]

MSB3645:. NET Framework v3.5 Service Pack 1 was not found. In order to
target "(0)",. NET Framework v3.5 Service Pack 1 or later must be installed.
I'm trying to move an ipy/wpf application that I inherited to IPY 2.6 and
.NET 4.0 on Windows 2008 Server. I got the above error message, referencing
a "xxxxx.csproj" file deep in my project directory, so I installed Visual
studio and opened it up, but the project file shows the target is .NET
Framework 4.

This is a clean install of 2.6 and 4.0 on a brand new system, so not sure
what I have to do to convince this thing that I'm trying to run as 4.0 and
not 3.5. I've worked on the IPY source for the project, but didn't have
anything do do with the initial setup, so I'm pretty well baffled. Anyone
successfully move a project from and earlier version of .NET to 4.0?
Ken
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