(> 5 *delivery-level*)
If this is non-nil, by default delivery retains the full TTY debugger, so it can be used when debugging delivered applications.
On Unix, if the value is
:all, all debug information is kept
On all platforms, if
:keep-debug-mode is set to
:keep-packages, all packages are retained as well as the debugger, so that they can be used for debugging purposes.
The value of
:keep-debug-mode affects the default value of the following keywords to:
LispWorks Delivery User Guide - 10 Aug 2017