I'm seeing something weird, where Guix is creating different derivations based on the same Git commit, between two machines of the same system type: Computer A: ------ $ lscpu | grep Architecture Architecture: x86_64 $ guix describe Generation 180 Oct 17 2021 23:07:29 (current) guix 473ea16 repository URL: https://git.savannah.gnu.org/git/guix.git branch: master commit: 473ea161a15a13e7d5e7e0724693c1931ff8daaa $ guix time-machine --commit=c70eadeaed9367e45be3797a17d3a34e5f8f67cd -- build --no-grafts hello -d /gnu/store/260bk0ch4np4h2yz5yqhf8hjbsyhwpmr-hello-2.10.drv ------ Computer B: ------ $ lscpu | grep Architecture Architecture: x86_64 $ guix describe Generation 23 Oct 18 2021 00:23:51 (current) guix 473ea16 repository URL: https://git.savannah.gnu.org/git/guix.git branch: master commit: 473ea161a15a13e7d5e7e0724693c1931ff8daaa $ guix time-machine --commit=c70eadeaed9367e45be3797a17d3a34e5f8f67cd -- build --no-grafts hello -d /gnu/store/vs34g0npra395dsqyplrjrwlm417a1w4-hello-2.10.drv ------ I've attached the two drv files.