https://www.iam.uni-bonn.de/fileadmin/user_upload/gubinelli/...
And he has a workable guile 2/3 branch on github at 1. https://github.com/mgubi/texmacs/tree/guile2 2. https://github.com/mgubi/texmacs/tree/guile3
We have planed to upgrade to guile 2/3 after the release of TeXmacs 2.1 .
TeXmacs 2.1 will be released in the next few months.