b56 non-debug ON encumbered binaries
By Alan Hargreaves-Oracle on Jan 24, 2007
They can be downloaded from The Download Centre. I've also updated the MD5 Checksums for the extra files.
Note that as of build 54, you no longer need the fiddle to usr/src/Makefile that was previously required to do non-debug builds, so have a look at the new instructions.
Dennis Clarke has also written a great step by step guide.