* Hydra doesn't like spaces in filenames. * The zip file contained nix/store/.../OEBPS rather than OEBPS at top-level, causing some programs (like okular) to barf. * Remove the redundant $dst/epub directory.
To build the manual, you need Nix installed on your system (no need
for NixOS). To install Nix, follow the instructions at
https://nixos.org/nix/download.html
When you have Nix on your system, in the root directory of the project
(i.e., `nixpkgs`), run:
nix-build nixos/release.nix -A manual.x86_64-linux
When this command successfully finishes, it will tell you where the
manual got generated.