A pregenerated `./configure` script is included with `zsh` release tarballs which makes it so that `zsh` won't build Git checkouts without `autoreconfHook`. There are also other files that were pregenerated and included in releases so a few other tools are necessary to successfully build `zsh`. We can also build the docs ourselves instead of using the `docs` tarball. This means that users can now easily override the `zsh` derivation: pkgs.zsh.overrideAttrs (old: { src = fetchgit { url = "https://git.code.sf.net/p/zsh/code.git"; rev = "zsh-5.8"; sha256 = "sha256-Gou2UgafLHnZnG2X8DulidOTO1idTQpnZ3DicZuhCZc="; }; })