Hello Guix! Good news: the new machine, bayfront.guixsd.org, is building Guix master for x86_64/i686 with Cuirass⁰! You can get substitutes from https://bayfront.guixsd.org; just authorize its key (with ‘guix archive --authorize’), which is: (public-key (ecc (curve Ed25519) (q #8D156F295D24B0D9A86FA5741A840FF2D24F60F7B6C4134814AD55625971B394#))) The machine was initially installed using substitutes from hydra.gnu.org, but ever since it has been building stuff on its own (it does not offload to any other machine at this point). Thus it can be used to check for reproducibility issues: guix challenge gdk-pixbuf \ --substitute-urls="https://mirror.hydra.gnu.org https://bayfront.guixsd.org" The machine runs GuixSD and its config is under version control: http://git.savannah.gnu.org/cgit/guix/maintenance.git/tree/hydra/bayfront.scm Currently Cuirass doesn’t expose much over HTTP¹ but hopefully we can incrementally add the URLs that guix-hydra.el expects. There are a few glitches to address, such as the fact that it builds with max-jobs = 1 due to , but we’ll get there. Woohoo! :-) Ludo’. ⁰ See and if you missed the previous episodes. ¹ https://notabug.org/mthl/cuirass/src/master/src/cuirass/http.scm