Common Lisp/External libraries/ASDF/Configuring ASDF

Configuring ASDF
Most frequently, you will add settings for asdf to the configuration file for your lisp system. For example, sbcl uses  while cmucl uses. The most important setting is the central registry described below. Most of the other configuration settings are optional.

asdf:*central-registry*
The central-registry is a list of file directories that will be searched for system definition files and is the least you need to know about configuring ASDF. The safest way to modify asdf:*central-registry* is to use pushnew to push a new directory onto the list.

Automatically updating stale fasl files
From http://www.cliki.net/asdf

Alternative to symlinks, search directories recursively
The standard way of adding libraries to ASDF involves either: The following code snippit shows how to recursively search through subdirectories for asdf packages.
 * 1) Making a symbolic link for the   file in a directory listed in    or
 * 2) Adding directories to.

From http://www.cliki.net/asdf