Joe Darcy released OpenJDK6 b18 yesterday evening and this is now integrated with the latest IcedTea6 from Mercurial.

To build:

$ hg clone http://icedtea.classpath.org/hg/icedtea6
$ mkdir icedtea6-build
$ cd icedtea6-build
$ ../icedtea6/configure
$ make

Then grab a beverage of your choice and wait a while… I recommend adding --with-parallel-jobs to the configure invocation if you have a multi-core machine.

Once built, you will have a build of OpenJDK6 which can use the Nimbus Look and Feel as explained in my previous blog