The files are in the repository under ldawn. The repository is named wnp. To access it, follow the instructions here. You'll need to be approved by the repository owner, who is JBG. You'll need gsl installed. If you don't have root on a machine and can't add to the normal include directory, look at the "make jbg" entry in the Make file to see how to point to a different directory.
You'll also need some data files, which can be found here.
How to Run
I'll add this soon. Until then, after compiling with make, run ./ldawn -help to see all the options.
A part of Wordnet_plus