5cd6c65054
Nixpkgs' channel currently can't move forward so long as there is a trace in evaluating the top-level arguments. Which means that it isn't possible to add a warning message to warn users of future package removal. So the only way forward appears to be just removing the alias altogether. (cherry picked from commit b4133ebc17c2742a76d912f4f0bf46719bc7800e)
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.