Hello! Somehow after applying your patch and running "$ ./pre-inst-env guix lint usync" the following error appears, probably syntax error somewhere, can't figure it out though, can you take a look? I ran something like this to apply the patch on current GNU Guix master (a2ece4da1fdccb9e94681e38a3f3a79b0d43e061): $ curl https://issues.guix.gnu.org/issue/46572/raw/0 | git am Backtrace: In ice-9/boot-9.scm: 1736:10 19 (with-exception-handler _ _ #:unwind? _ # _) In guix/store.scm: 636:37 18 (thunk) 1305:8 17 (call-with-build-handler # …) In guix/scripts/build.scm: 499:2 16 (_) In srfi/srfi-1.scm: 673:15 15 (append-map _ _ . _) 586:17 14 (map1 ((argument . "usync") (build-mode . 0) (# . #t) …)) In guix/scripts/build.scm: 519:30 13 (_ _) In gnu/packages.scm: 477:2 12 (%find-package "usync" "usync" #f) 362:6 11 (find-best-packages-by-name _ _) 292:55 10 (_ "usync" _) In unknown file: 9 (force #) In gnu/packages.scm: 239:33 8 (fold-packages # …) In guix/discovery.scm: 153:11 7 (all-modules _ #:warn _) In srfi/srfi-1.scm: 460:18 6 (fold # …) In guix/discovery.scm: 143:19 5 (_ _ ()) In srfi/srfi-1.scm: 691:23 4 (filter-map # . #) In guix/discovery.scm: 118:22 3 (_ . _) In ice-9/eval.scm: 619:8 2 (_ #(#(# (# "re…" …)))) In ice-9/boot-9.scm: 1669:16 1 (raise-exception _ #:continuable? _) 1669:16 0 (raise-exception _ #:continuable? _) ice-9/boot-9.scm:1669:16: In procedure raise-exception: Throw to key `match-error' with args `("match" "no matching pattern" (unbound-variable "resolve-interface" "no binding `~A' in module ~A" (python (gnu packages python)) #f))'. Thank you!