I think this is the old non-UTF8 encoding grafting issue (if you ask me, I'll send you the link). Try: --8<---------------cut here---------------start------------->8--- guix build --no-grafts nyxt --8<---------------cut here---------------end--------------->8--- If this is the case, nothing Nyxt can do here I'm afraid, as it's a Guix issue with the reference scannr (it does not find non-UTF8 references). -- Pierre Neidhardt https://ambrevar.xyz/