'plot/vglt' is from version 1 plotting. Version 2 uses 'plot/vega'. If you're seeing VGLT in the ASDF file it means that it's the old version, and you'll need to pull in the source for a manual install from github until Quicklisp gets updated. The systems you'll need are:

- alexandria+

- data-frame

- dfio

- lisp-stat

- plot

- numerical-utilities

- select

- sqldf

It may be easier to get help from one of the community resources [1] (StackOverflow, github issue/discussion, mailing list) than HN, as those are always monitored.

[1] https://lisp-stat.dev/community/