The System Browser tool allows integration of source code managers.
There is an example for integrating ASDF in
(lw:example-file "misc/asdf-integration.lisp")
The interface is described in some detail in the remainder of this section, but the example above is sufficient to allow you to use ASDF in the LispWorks IDE.
LispWorks IDE User Guide (Macintosh version) - 25 Nov 2011