67d1cf4707
ibus-qt has not seen a release in 5 years and is only relevant for Qt 4.x, which is becoming more and more rare. Using my current laptop as a data point, ibus-qt is the only dependency left that drags in qt-4.8.7.
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.