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Eclipse transitioned from having one directory for each
plugin to packaging plugins as .jar files over the 3.1
release cycle. Releases up to 3.1-M4 or so have plugin
directories, later releases have .jar files.

IVI 1.0.1's configure script only recognizes the 'directory'
plugins. Using Eclipse 3.1-M4 will probably give the best
results. IVI 1.0.2's configure script will recognize both
.jar and 'directory' plugins.

A potential workaround is to build IVI with eclipse 3.1-M4,
but install in a later version of eclipse.