example of using external libraries or packages in Common Lisp
问题 In Common Lisp, quicklisp is a popular library management tool. I'm going to use that tool and I'm going to try and use CL-WHO. I use the SBCL 1.0.57 implementation. I'm going to answer my own question below. As a beginner, it's not clear how ASDF and quicklisp actually work together. And so it's not clear how to actually use packages or libraries that you've downloaded through quicklisp in an external source file. The quicklisp FAQ, at least at this moment, does not help. In python, it's