Hudson-darcs is a project mainly written in Java, based on the View license.
This plugin integrates Darcs SCM into Hudson.
In the GitHub download section are compiled Jenkins plugins (.hpi) for each version available. You can find the darcs.hpi file in side the tar/zip archive. The plugin itself is archived, because of naming issues: The hpi itsel must be named 'darcs.hpi' without version numbers in the filename. But to seperate different precompiled plugins they are archived with versioned names. Download an apropriate archive, unpack it and and upload the resulting darcs.hpi to your Jenkins.
As prerequisite you need Maven2 installed.
In your ~/.m2/settings.xml you need: