As announced in the previous log, STM8 eForth now has a Modular Build feature. This doesn't sound like much but it massively reduces the effort of supporting your design!
The repository contains the DEMO board configuration folder which is both how-to and example.
In hindsight, this is a very good example for bad web site design since the most important part of the manual is easily overlooked (even if the technical structure is right).
If you want to try it, a good way of using this repository is downloading the code as a zip file and then make your own repository. The structure is the message, and forking will add little benefit. You can, of course, give credit and star the repo :-)