When retrieving the files for a system using git, one should be able to specify should be able to For example, the system [clack-errors is installed with missing files](https://github.com/eudoxia0/clack-errors/issues/2). This would be fixed by doing a `git submodule update` It appears to already have been reported in https://github.com/quicklisp/quicklisp-projects/issues/394