Hi Maxime! >> +(define-public tgcli >> [...] >> + (replace 'check >> + (lambda _ >> + (invoke "pytest")))))) > > Something I learned some time ago: if you make this > >> + (replace 'check >> + (lambda* (#:key tests? #:allow-other-keys) >> + (when tests? >> + (invoke "pytest"))))))) > > then "guix build tgcli --without-tests" can be used, IIRC. Thanks so much! I added it in v2. Regards, RG.