`gtk-rs` not working with flake

Help
1

I’m trying to make an app using gtk-rs.
I’ve got all the Rust stuff sorted, but I can’t get it to run using a flake.

I’ve created this flake (using stuff I found online):

Flake 
{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
    utils.url = "github:numtide/flake-utils";
  };

  outputs =
    {
      self,
      nixpkgs,
      utils,
    }:
    utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
      in
      {
        packages.default = pkgs.rustPlatform.buildRustPackage {
          name = "gtk-rs-test";
          src = ./.;
          buildInputs = with pkgs; [ gtk4.dev ];
          nativeBuildInputs = with pkgs.buildPackages; [
            pkg-config
            gtk4.dev
          ];
          cargoLock.lockFile = ./Cargo.lock;
        };
      }
    );
}

If I try to nix run I get this error:

Error 
error: Cannot build '/nix/store/d8lpnnk7y2v1rk4p73nmxzcxdrwggddx-gtk-rs-test.drv'.
       Reason: builder failed with exit code 101.
       Output paths:
         /nix/store/gkr3d4c1ndrwn19ibal30qyfm2n5nh0n-gtk-rs-test
       Last 25 log lines:
       >       - /nix/store/r5dnrkpnds4xi52cdwakbjvvx049cj3x-brotli-1.1.0-dev/lib/pkgconfig
       >       - /nix/store/1hkdki45cpkpkmszjm3mafac1igj6qyf-libpng-apng-1.6.50-dev/lib/pkgconfig
       >       - /nix/store/zx88hmmi1an1gfyrfbzm4ga77qii30d5-pixman-0.46.4/lib/pkgconfig
       >       - /nix/store/c70mx04ih0h6lnyqji8hgh7q1hgwcg59-libxext-1.3.6-dev/lib/pkgconfig
       >       - /nix/store/nml7jra2yzxg133ssim80aj39f4668gc-xorgproto-2024.1/share/pkgconfig
       >       - /nix/store/psd6a1kxjs4xyrqxy623s2948k0y5ash-libxau-1.0.12-dev/lib/pkgconfig
       >       - /nix/store/xgc6bxmjmsw5qd8yfr22cqc8x215j8cs-libxrender-0.9.12-dev/lib/pkgconfig
       >       - /nix/store/20q72vi8wdb7j6p9sdnpi32477j6nv2z-libx11-1.8.12-dev/lib/pkgconfig
       >       - /nix/store/27czksni7m3kji791lvfdl40n99f71q8-libxcb-1.17.0-dev/lib/pkgconfig
       >       - /nix/store/ly2cp9lbsbds7qkn04098svwc5m64yvv-glib-2.84.4-dev/lib/pkgconfig
       >       - /nix/store/z0hijbjl01x3xwqwmabddhj7l9nm7zy5-libffi-3.5.2-dev/lib/pkgconfig
       >       - /nix/store/1czky7inzmyir9421d8aybahp51lf2ds-gdk-pixbuf-2.42.12-dev/lib/pkgconfig
       >       - /nix/store/ks8qbv15kvqsixbhs1vwy0nnh17y5fga-libtiff-4.7.1-dev/lib/pkgconfig
       >       - /nix/store/mfnqd0l258v2vdyxynbw2dq129z7sad3-libjpeg-turbo-3.1.2-dev/lib/pkgconfig
       >       - /nix/store/jbg4x930kfzpjfrw239y78bl6df4i8xw-graphene-1.10.8-dev/lib/pkgconfig
       >       - /nix/store/8xd82yxllimranyhgx3372c16iydxgsa-pango-1.56.4-dev/lib/pkgconfig
       >       - /nix/store/izaxd55idp7vqyxsw8kci0y4d12zbc7h-harfbuzz-12.1.0-dev/lib/pkgconfig
       >       - /nix/store/xpwg3r0dcmn431h2ms1j0zq66ag3qsb7-graphite2-1.3.14-dev/lib/pkgconfig
       >       - /nix/store/y2kz6kw58c3hdya6h7xx308v3vj2p023-libxft-2.3.9-dev/lib/pkgconfig
       >       - /nix/store/465lj8xn3vp4xfand16iqlwx1kqgc4id-wayland-1.24.0-dev/lib/pkgconfig
       >       - /nix/store/szq0xnk6r3wnq1j9xl77vbxsc4xi87wb-vulkan-loader-1.4.328.0-dev/lib/pkgconfig
       >       - /nix/store/03iq7iqv9avzxhxpf791n0asqg11rj3a-gsettings-desktop-schemas-48.0/share/pkgconfig
       >
       >   HINT: you may need to install a package such as gtk4, gtk4-dev or gtk4-devel.
       >
       For full logs, run:
         nix log /nix/store/d8lpnnk7y2v1rk4p73nmxzcxdrwggddx-gtk-rs-test.drv

So pkg-config doesn’t find gtk4, but even if I create a shell which has cargo, pkg-config and gtk4.dev in it, it fails to compile at the same point, while having gtk4.pc in one of the paths. (ok, that’s a different thing, but I still wanted to mention it in case it is relevant)

Does anyone know whats wrong or how I can fix it?

2

Don’t do this buildPackages .dev stuff.
Just put it it in packages and use pkgs.gtk4 and pkgs.pkg-config.

pkgs.bindgenHook may be helpful as well, also see https://nixos.org/manual/nixpkgs/unstable/#hooks

3

You’re where right, buildPackages and .dev where nonsense. I’m not sure how to use packages and hooks, but just using pkgs.* in (native)buildInputs fixed it.

Working Flake 
{
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
    utils.url = "github:numtide/flake-utils";
  };

  outputs =
    {
      self,
      nixpkgs,
      utils,
    }:
    utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
      in
      {
        packages.default = pkgs.rustPlatform.buildRustPackage {
          name = "gtk-rs-test";
          src = ./.;
          cargoLock.lockFile = ./Cargo.lock;
          buildInputs = with pkgs; [
            gtk4
          ];
          nativeBuildInputs = with pkgs; [
            pkg-config
          ];
        };
      }
    );
}

Which is a bit confusing to me cause I’m pretty sure I tried that.

Anyways, thanks for your help!

4

packages is just a convenience alias for nativeBuildInputs. Slightly less to type and remember :slight_smile:

By default, just put all deps in packages - this will ensure setup hooks are handled properly. pkgs.bindgenHook is a setup hook, so if you needed it, it would also go in packages.

2 Likes
5

Runtime deps have to go into buildInputs, right?

So packages / nativeBuildInputs is just for build deps.