Completing myself, Nicolas Goaziou writes: > + (add-after 'install 'link-to-grammalecte > + ;; The package expects grammalecte to be in a sub-directory. > + ;; Symlink it there from the store. > + (lambda* (#:key inputs outputs #:allow-other-keys) > + (let ((grammalecte (assoc-ref inputs "grammalecte")) > + (out (assoc-ref outputs "out")) > + (version ,(version-major+minor (package-version python)))) > + (with-directory-excursion > + (string-append out > + "/share/emacs/site-lisp/guix.d/" > + "flycheck-grammalecte-" ,version) > + (symlink (string-append grammalecte "/lib/" > + "python" version "/site-packages/" > + "grammalecte") > + "grammalecte")))))))) I forgot a #t here. I'll add it. I'm not sending the updated patch. > + (inputs > + `(("grammalecte" ,grammalecte) > + ("python" ,python))) > + (propagated-inputs > + `(("emacs-flycheck" ,emacs-flycheck))) > + (home-page "https://git.deparis.io/flycheck-grammalecte/") > + (synopsis "Integrate Grammalecte with Flycheck") > + (description "Integrate the French grammar and typography checker > +Grammalecte with Flycheck to automatically look for mistakes in your > +writings. It also provides an easy way to find synonyms and antonyms for Missing space here. Also fixed.