open the asdf file, enable slime, C-C C-k
then in slime (ql:quickload "thanh-pg")
http://lispcookbook.github.io/cl-cookbook/getting-started.html#how-to-load-an-existing-project
open the asdf file, enable slime, C-C C-k
then in slime (ql:quickload "thanh-pg")
http://lispcookbook.github.io/cl-cookbook/getting-started.html#how-to-load-an-existing-project