Read this page:
http://cusp.devjavu.com/wiki/DevStart
Especially these two points:
# Sometimes you need to provide .classpath file to compile and launch
plugin from development environment. Here is what you can do: Go to
File->New->Project->Plug-in Project Keep everything default and create
temporary project. Then go to project folder and find .classpath file.
Copy it to jasko.tim.lisp folder before importing plugin to Eclipse
using File->Import->Existing Projects into Workspace.
# On Windows it may be necessary to edit jasko.tim.lisp
\build.properties and remove trailing slashes from all directory
names. Also Eclipse Plug-in libraries need to be added as an external
dependency (project properties->Java Build Path->Libraries->Add
Library->Plug-in Dependencies)
Also, it looks like right now there is a mess in repository since it
was not initially set up for branching and I made release 1.0 branch
per Scott's request. I am not sure how and who will resolve this
though.
(I think you will see duplicate subfolders in source).