Hi Ricardo, > The correct solution to this problem would be to add a little build > cycle: build a bootstrap version of pdflatex (and the other formats) so > that we can build babel; then rebuild pdflatex (and all the other > formats, and everything that goes into texlive-latex-base) in an > environment where babel exists. indeed, adding this package variation to the manifest fixed the issue for me: ---snip--- (define-public texlive-latex-base-fixed (package (inherit texlive-latex-base) (name "texlive-latex-base-fixed") (propagated-inputs (modify-inputs (package-propagated-inputs texlive-latex-base) (append texlive-babel))))) ---snap--- Looking at `guix refresh -l texlive-latex-base` a change like that would be a world rebuild though. I tried adding something similar to Guix’ tree, but there’s a loop somewhere I can’t figure out (see attached patch). I’m guessing through texlive-build-system’s #:texlive-latex-base. Cheers, Lars