`lilv`: `lilvmm.hpp` not including `lilv.h`

[JuxGD]

Describe the bug

The lilv package seems not to be working for development properly. lilvmm.hpp isn't including lilv.h. VS Code says 'cannot open source file "lilv/lilv.h"'

This happens under a shell.nix and flake.nix (with nix develop), and lilv, gcc under buildInputs in pkgs.mkShell. If I change it to #include <lilv-0/lilv/lilv.h> instead, then VS Code tells me the problem's fixed, but I can't save it since it's read-only.

Steps To Reproduce

Steps to reproduce the behavior:

1. Install lilv (and gcc) to a shell environment
2. In a project, include lilvmm.hpp: #include <lilv-0/lilv/lilvmm.hpp>
3. Try to compile with g++
4. nope

Expected behavior

It includes it :p

Screenshots

The error in VS Code

Additional context

flake.nix:

{
  description = "i like snowflakes";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
  };

  outputs = { self, nixpkgs }:
  let
    system = "x86_64-linux";
    pkgs = nixpkgs.legacyPackages.${system};
  in
  {
    devShells.${system}.default =
      pkgs.mkShell
        {
          buildInputs = [
            pkgs.gcc
            pkgs.lilv
          ];
        };
  };
}

Metadata

- system: `"x86_64-linux"`
- host os: `Linux 6.6.60, NixOS, 24.11 (Vicuna), 24.11.20241109.76612b1`
- multi-user?: `yes`
- sandbox: `yes`
- version: `nix-env (Nix) 2.24.10`
- channels(root): `"nixos"`
- nixpkgs: `/nix/store/0sxsfzswhjck7f4sbsvznz285s4i7y64-source`

Notify maintainers

If in doubt, check git blame for whoever last touched something.

@emilazy

---

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Add a :+1: reaction to issues you find important.

[emilazy]

I’m afraid I have no knowledge of this package whatsoever. Maybe look at the history before it was moved, although that seems to show the classic story of a package being added, abandoned, and then kept going indefinitely by treewide contributors who have probably never used it.

Does it come with a .pc file that specifies the appropriate include directory flags to use?

[JuxGD]

Oh yeah sorry I forgot how this worked. Thanks for taking the time tho!

I did find a .pc file: /nix/store/x21b1fmbwqpi94rb2l2p7lvqdh0smxzc-lilv-0.24.24-dev/lib/pkgconfig/lilv-0.pc:

prefix=/nix/store/d071awgh0fhr0rz45kl7ngj2hcr1fh2f-lilv-0.24.24
includedir=/nix/store/x21b1fmbwqpi94rb2l2p7lvqdh0smxzc-lilv-0.24.24-dev/include
libdir=${prefix}/lib

Name: Lilv
Description: Library for hosting LV2 plugins
Version: 0.24.24
Requires: lv2 >=  1.18.2
Requires.private: serd-0 >=  0.30.10, sord-0 >=  0.16.15, sratom-0 >=  0.6.10, zix-0 >=  0.4.0
Libs: -L${libdir} -llilv-0
Libs.private: -ldl -lm
Cflags: -I${includedir}/lilv-0

Unlike the pkgconfig directory for other packages, this one's not getting symlinked to /run/current-system/sw/lib/pkgconfig for some reason (I think I'm getting this correctly). But it looks like doing an export PKG_CONFIG_PATH=<the directory> doesn't really do anything either (but i'm new to this so idrk)

[emilazy]

Usually you really don’t want to install libraries in your global environment, so I wouldn’t rely on that linking in the first place. Glad to hear you got it working though!

[JuxGD]

Usually you really don't want to install libraries in your global environment

Right, I forgot that too

I didn't get it working tho, I tried adding pkg-config to both buildInputs and nativeBuildInputs and it didn't work :(

[emilazy]

You’ll want nativeBuildInputs = [ pkg-config ];, buildInputs = [ lilv ];, and to ensure that your build system/IDE is using pkg-config to get the relevant compiler flags.