I am on the way to port SBCL Common Lisp (http://sbcl.org/) to Haiku.
SBCL is The Common Lisp ™ in almost all respects. It is open source, standard compliant, is ported to many operational systems and hardware architectures and has high performance. All new technologies, infrastructure and packages written in Common Lisp are usually firstly and primarily target SBCL implementation.
My ultimate goal is to upstream all the code to SBCL and to provide Haiku hpkg in Depot. I contacted SBCL team and with their assistance (better said, trying their code) the process seems to progress.
I will post here about important milestones. If somebody is interested in joining, he/she is/are welcome. Additionally, I would like to avoid duplication of the effort. If you know of any previous work done in this direction, I would be happy to use it.