An excluded package was recently moved. The Eclipse ".classpath" file should be updated to reflect the change. Currently Eclipse will not compile the entire project because the package has errors. Building on the command line using the Ant build file seems to be fine however.
The package was
but is now
A pull request was already made by Wade Walker to fix this bug.
Offtopic, but since you're building in Eclipse, I thought you might be interested -- I'll submit some more pull requests shortly that speed up the incremental compile behavior in Eclipse.
thank you guys, merged!