Still hooked on BLUE. Hacked all day yesterday and today converting Dezyne's (https://dezyne.org) build system. Opened six issues, and two pull requests, one already merged.
It's not perfect *just* yet, in fact, some issues are show-stoppers for BLUE to replace Autotools for Dezyne, which has a pretty "interesting" build system.
I would very much recommend to anyone who has a soft-spot for build-systems and/or Guile to take a look.
However, the experience of hacking a build system in Guile is amazing! And I'm certain the show-stoppers will be resolved some time soon.
https://codeberg.org/lapislazuli/blue
cc: 
@cwebberChristine Lemmer-Webber 
@regtur 
@civodulLudovic Courtès
@nlnet
