[BUG] Clangd is missing libz.so.1 in lsp

[i-ilak]

Field	Description
Plugin	lsp
Nixpkgs	nixos-unstable
Home Manager	24.11-pre

• [x] I have read the FAQ and my bug is not listed there.

Description

I'm having trouble running clangd with nixvim. Whenever I run it in my configuration, I see an error of this form:

[ERROR][2025-03-18 15:28:34] .../vim/lsp/rpc.lua:770	"rpc"	"/nix/store/zqdqx2z1sng4yqqbwz8cga0dgwv3r37p-clang-tools-18.1.8/bin/clangd"	"stderr"	"/nix/store/zqdqx2z1sng4yqqbwz8cga0dgwv3r37p-clang-tools-18.1.8/bin/clangd: error while loading shared libraries: libz.so.1: cannot open shared object file: No such file or directory\n"

Minimal, Reproducible Example (MRE)

The setup looks something like this (apologies if this is not the most minimal example, but I'm not 100% sure in which part the error happens...)

#flake.nix
nvim = nixvim'.makeNixvimWithModule {
  inherit pkgs;
  module = ./config;
};

#config/default.nix
{}:
{
  imports = [
    lsp.nix
  ];
}

#lsp.nix
{ pkgs
, ...
}: {
  plugins = {
    lsp-format = {
      enable = true;
    };
    lsp = {
      enable = true;
      servers = {
        clangd = {
          enable = true;
          package = pkgs.llvmPackages_18.clang-tools;
          cmd = [
            "clangd"
            "--offset-encoding=utf-16"
            "--background-index"
            "-j"
            "20"
            "--clang-tidy"
          ];
        };
      };
    };
  };
}

Which is the used like this in a configuration:

#flake.nix
{
  inputs = {
    nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";
    nixvim = {
      url = "github:i-ilak/nixvim-config";
      inputs.nixpkgs.follows = "nixpkgs-unstable";
    };
  }

  outputs = {
    ...
    } @ inputs 
  : {
      homeConfigurations = {
        # some deeper nesting, but in the end
        home.packages = [
                inputs.nixvim.packages.${pkgs.system}.default
        ];
      };
    };
}

Any idea why this shared object ins not in the LD_LIBRARY_PATH, or symlinked to the default locations Linux expects?

[GaetanLepage]

This is weird indeed. But I feel like this is an issue with how clangd is packaged in nixpkgs whether than a Nixvim issue...

[i-ilak]

Thought so, will see if I can find anything on nixpkgs and otherwise create new issue there...