Hi, I have been putting off building emacs-forge with emacs-pgtk due to it having emacs-yaml as a dependency. I just checked the link to the upstream issue [0] and it's now be fixed and released in v1.2.0! Which is in Guix.
I verified it by building emacs-forge (and emacs-yaml) and it built within reasonable time. So this issue can be closed. [0] https://github.com/zkry/yaml.el/issues/53 -- s/Fred[re]+i[ck]+/Fredrik/g
