HTTP -> HTTPS for : - http://gnu.org/ - http://www.gnu.org/ - http://elpa.gnu.org/ - http://lists.gnu.org/ - http://gcc.gnu.org/ - http://ftp.gnu.org/ (except in fetchurl mirrors) - http://bugs.gnu.org/
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.