I just double checked the Sharpdevelop project solution file, it's set up to target Compact Framework 2.0.
I have also check what SDK I have installed: "Microsoft .NET Framework 2.0 SDK - ENU", there are no other SDK's installed...
I use an HD2 which has CF 3.5 built in, so haven't been able to check out the library on a device with CF 2.0.
Which device are you trying to use the library on? what version of CF is native on the device and have you installed a later version?
I'm a bit of a noob with Microsoft development (I work in automotive embedded ECU software), so if anyone else has any suggestions, please pipe up,
Karl.