mpv: Undefined reference when linking simple libmpv example

[BKSalman]

Describe the bug

I'm trying to use the mpv from the unstable channel (because it has a patch related to this issue),

but I can't compile this example and gives me this error:

└─> gcc -o simple simple.c `pkg-config --libs --cflags mpv`

/nix/store/lz1bwpdvlywij5ir0fmncgqa83dlpwhn-binutils-2.39/bin/ld: /nix/store/qr4br1dgaiwxjr75xk8hh6p1avi5xyq8-openal-soft-1.22.2/lib/libopenal.so.1: undefined reference to `std::condition_variable::wait(std::unique_lock<std::mutex>&)@GLIBCXX_3.4.30'
collect2: error: ld returned 1 exit status

when I add mpv from the unstable channel in my shell.nix file:

let
  system = "x64_86-linux";
  unstable = import <nixos-unstable> { allowUnfree = true; };
in
{ pkgs ? import <nixpkgs> { allowUnfree = true; } }:
   pkgs.mkShell rec {
    buildInputs = with pkgs; [
      unstable.mpv
      unstable.pkg-config
    ];
  }

I also tried using mpv-unwrapped.dev, but didn't work.

I can provide more context if needed

Steps To Reproduce

Steps to reproduce the behavior:

1. create shell.nix with unstable channel mpv, and pkg-config
2. clone libmpv simple example
3. compile with gcc -o simple simple.c `pkg-config --libs --cflags mpv (as specified in the example C file)

Expected behavior

Should be able to compile the mpv example mentioned in the bug description

Notify maintainers

@AndersonTorres @fpletz @globin @Ma27 @tadeokondrak

(sorry if mentions were unnecessary)

Metadata

└─> nix-shell -p nix-info --run "nix-info -m"

 - system: `"x86_64-linux"`
 - host os: `Linux 5.15.103, NixOS, 22.11 (Raccoon), 22.11.20230318.08ef7dc`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.11.1`
 - channels(salman): `"home-manager-22.11.tar.gz, nixos-unstable"`
 - channels(root): `"home-manager-22.11.tar.gz, nixos-22.11"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

[BKSalman]

Turns out that I was mixing 2 different channels (unstable, and 22.11 channel) which caused libmpv (or one of its dependencies) to be compiled with a different libstdc++ version than the one used when compiling the libmpv example

thanks to @TommyLuco for guiding me :)