commons-betwixt-0.6-r2 (Update) commons-betwixt-0.6-r1 wouldnt emerge for me because it didnt create the target/lib dir, add the jars to classpath, and rename the file jar. I added that and created a new ebuild and patch. I dont claim to be an expert in ebuilds, but it worked for me .:)
Created attachment 61025 [details] new ebuild
Created attachment 61026 [details, diff] edits the build.xml to add some needed steps
fixed in cvs, thanks for reporting.