ql:uninstall should accept a list of systems to uninstall

[Symbolics]

As it is, systems have to be uninstalled one-by-one
Also, a :remove-dependencies option would be nice for those systems that pull in the entire universe

[Hexstream]

Agreed, meanwhile (mapc #'ql:uninstall list-of-systems) is a simple workaround.

[obicons]

#164

In the latest version of quicklisp
(mapc #'ql:uninstall (mapcar #'ql-dist:short-description (ql-dist:installed-systems t)))