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6.1 The defsystem form

This section begins with an example of a system definition, then gives the full grammar of defsystem.

Let’s look at a simple system. This is a complete file that should be saved as hello-lisp.asd (in order that ASDF can find it when ordered to operate on the system named "hello-lisp").

;; Usual Lisp comments are allowed here

(defsystem "hello-lisp"
  :description "hello-lisp: a sample Lisp system."
  :version "0.0.1"
  :author "Joe User <>"
  :licence "Public Domain"
  :depends-on ("optima.ppcre" "command-line-arguments")
  :components ((:file "packages")
               (:file "macros" :depends-on ("packages"))
               (:file "hello" :depends-on ("macros"))))

Some notes about this example:

This is all you need to know to define simple systems. The next example is much more involved, to give you a glimpse of how you can do more complex things. However, since it’s ultimately arbitrary Lisp code, there is no bottom to the rabbit hole.

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