I installed Spartan2e devices but I can't implement a design targeting them. Inspecting the
Spartan2e data directory shows there are no files.
Spartan2e libraries are based on Spartan2. The first software release
with Spartan2e support did not see the libraries.
The workaround is to be sure to install Spartan2 devices as
well as Spartan2e, use Spartan2 libraries during implementation,
and you will be able to choose to target a Spartan2e device.