brettg@posteo.net skribis: > brettg@guixsd ~/Repos/guix-system [env]$ guix build fstar -L . [...] > In gnu/packages.scm: > 260:33 7 (fold-packages # …) > In srfi/srfi-1.scm: > 466:18 6 (fold # …) > In guix/discovery.scm: > 136:31 5 (_ "." ()) > 116:14 4 (scheme-modules _ _ #:warn _) > In srfi/srfi-1.scm: > 501:18 3 (fold-right # . #) > In guix/discovery.scm: > 66:32 2 (_ _ ("./channels.scm" "./non-gnu/packages/coq-extend.scm" "./non…" …)) > In srfi/srfi-1.scm: > 501:18 1 (fold-right # . #) > In unknown file: > 0 (append # ()) It looks like the error happens while traversing the “.” directory with your own files. Could you try inspecting it, or perhaps removing some of the files until you find the culprit? Thanks, Ludo’.