The main difference between the Arch/Debian approach and that of Nix and Guix is that Nix and Guix "normalize" the build environment using containers, whereas A

The main difference between the Arch/Debian approach and that of Nix and Guix is that Nix and Guix "normalize" the build environment using containers, whereas Arch, Debian, and others aim to achieve bit-reproducibility in spite of differences in the build environment. Thus some of the issues that apply to Arch or Debian do not apply to Guix and Nix, but many apply to both (timestamps are an obvious example.) For Guix we are currently at ~80% reproducible packages: https://gnu.org/software/guix/news/reproducible-builds-a-status-update.html https://gnu.org/software/guix/news/reproducible-builds-a-sta... . That's not an entirely fair comparison because, for example, Python packages in Guix include .pyc files whereas on Debian they don't (not sure about Arch).