Complete documentation for URL-REWRITE can be found in the 'doc' directory. Installation 1. Probably the easiest way is (load "/path/to/url-rewrite/load.lisp") This should compile and load URL-REWRITE on most Common Lisp implementations. 2. With MK:DEFSYSTEM you can make a symbolic link from 'url-rewrite.system' to your central registry (which by default is in '/usr/local/lisp/Registry/') and then issue the command (mk:compile-system "url-rewrite") Note that this relies on TRUENAME returning the original file a symbolic link is pointing to. This will only work with AllegroCL 6.2 if you've applied all patches with (SYS:UPDATE-ALLEGRO). 3. You can also use ASDF instead of MK:DEFSYSTEM in a similar way (use the .asd files instead of the .system files).