bug: programs.git.difftastic.enable doesn't install diffstatic

[lebensterben]

Are you following the right branch?

• My Nixpkgs and Home Manager versions are in sync

Is there an existing issue for this?

• I have searched the existing issues

Issue description

I have added

programs.git.difftastic.enable = true;

to my NixOS configuration, but somehow difft is not installed.

In fact if I run git diff ... it tells me exactly that:

error: cannot run difft: No such file or directory

That is to say, programs.git.difftastic.enable correctly configures difftastic as the external diff tool for git, but the binary is not correctly installed.

Maintainer CC

@rycee

System information

- system: `"x86_64-linux"`
 - host os: `Linux 6.6.30, NixOS, 24.05 (Uakari), 24.05.20240509.f1010e0`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.18.2`
 - nixpkgs: `/nix/store/asymc3nsl739p1wwr0w6xbjnqs3qb94p-source`