AFAICS everything is working fine with this config: --8<---------------cut here---------------start------------->8--- root@berlin ~/maintenance/hydra# guix describe Generation 45 Nov 28 2019 11:02:51 (current) guix 18a5575 repository URL: https://git.savannah.gnu.org/git/guix.git branch: master commit: 18a5575ec530f0e7a2e27f2aa3b5addf20da0f87 root@berlin ~/maintenance/hydra# git log |head commit 9fdb990982006a4d0ddb68aa71351cc76ef50cdc Author: Ludovic Courtès Date: Thu Nov 28 11:23:29 2019 +0100 nginx: berlin: Use nginx 1.17.4. * hydra/nginx/berlin.scm (nginx-1.17.4): New variable. (%nginx-configuration)[nginx]: New field. --8<---------------cut here---------------end--------------->8--- Please let me know if you encounter any issues! I’ll leave it at that for now, but we’ll have to pay attention to that in future upgrades. (Ideally we’d report a bug to nginx but that’s tricky enough that this alone would take much more time than I can allocate to it.) Ludo’.