Packaging programs with CEF dependencies

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I’m trying to build Bolt, which uses Chromium Embedded Framework for its GUI. First, I just bundled a binary distribution of CEF as recommended in its readme:

let pkgs = import (builtins.fetchTarball ("channel:nixos-23.11")) { };
in with pkgs; {
  default = let
    pname = "bolt-launcher";
    version = "0.8.2";
  in stdenv.mkDerivation {
    inherit pname version;
    srcs = [
      (fetchzip {
        name = "cef";
        url =
          "https://cef-builds.spotifycdn.com/cef_binary_121.3.6%2Bgbbcaed4%2Bchromium-121.0.6167.139_linux64_minimal.tar.bz2";
        hash = "sha256-aIc1/wduXsV2QCVmBtXIUsVARBy9lIHX4gbr1YhNgWM=";
      })

      (fetchFromGitHub {
        name = pname;
        owner = "Adamcake";
        repo = "Bolt";
        rev = version;
        sha256 = "sha256-nUhySKA1VKDMzSqsaoTKt5vy91npWe2Ob0+F5zROxOg=";
        fetchSubmodules = true;
      })
    ];
    sourceRoot = "bolt-launcher";

    nativeBuildInputs = [ git cmake ninja gcc pkg-config ];

    buildInputs = [ xorg.libX11 xorg.libxcb libarchive gtk3 openjdk17 ];

    postUnpack = ''
      ln -sfv ../../cef bolt-launcher/cef/dist
    '';

    cmakeFlags = [ "-DBOLT_SKIP_LIBRARIES=1" ];

  };
}

This fails to link libcef.so during buildPhase (e.g. ld: warning: libnss3.so, needed by /build/bolt-launcher/cef/dist/Release/libcef.so, not found)

I tried setting env.LD_LIBRARY_PATH = "${lib.makeLibraryPath [ ... ]}", and this actually built, linked and installed fine. But running result/opt/bolt-launcher/bolt gives “error while loading shared libraries.” I’m not sure how libcef.so can successfully be linked during the nix build and then throw this error afterwards?

I tried again with nixpkgs’s libcef:

let pkgs = import (builtins.fetchTarball ("channel:nixos-23.11")) { };
in with pkgs; {
  default = let
    pname = "bolt-launcher";
    version = "0.8.2";
  in stdenv.mkDerivation {
    inherit pname version;
    srcs = [
      (fetchzip {
        name = "cef-bin";
        url =
          "https://cef-builds.spotifycdn.com/cef_binary_121.3.6%2Bgbbcaed4%2Bchromium-121.0.6167.139_linux64_minimal.tar.bz2";
        hash = "sha256-aIc1/wduXsV2QCVmBtXIUsVARBy9lIHX4gbr1YhNgWM=";
      })

      (fetchFromGitHub {
        name = pname;
        owner = "Adamcake";
        repo = "Bolt";
        rev = version;
        sha256 = "sha256-nUhySKA1VKDMzSqsaoTKt5vy91npWe2Ob0+F5zROxOg=";
        fetchSubmodules = true;
      })
    ];
    sourceRoot = "bolt-launcher";

    nativeBuildInputs = [ git cmake ninja gcc pkg-config ];

    buildInputs =
      [ xorg.libX11 xorg.libxcb libarchive gtk3 openjdk17 libcef pcre2 ];

    cmakeFlags = [ "-DBOLT_SKIP_LIBRARIES=1" ];

    postUnpack = ''
      # Copied from the obs-linuxbrowser
      mkdir -p cef/Release cef/Resources
      for i in ${libcef}/share/cef/*; do
        cp -r $i cef/Release/
        cp -r $i cef/Resources/
      done
      cp -r ${libcef}/lib/libcef.so cef/Release/
      cp -r ${libcef}/include cef/

      cp -r cef-bin/cmake cef-bin/CMakeLists.txt cef-bin/libcef_dll cef/
      chmod -R 777 cef/libcef_dll
      cp -r ${libcef}/lib/libcef_dll_wrapper.a cef/libcef_dll/wrapper/
      ln -sfv ../../cef bolt-launcher/cef/dist
    '';
  };
}

But this now causes a build error: /build/bolt-launcher/cef/dist/libcef_dll/cpptoc/browser_process_handler_cpptoc.cc:101:50: error: 'class CefBrowserProcessHandler' has no member named 'OnAlreadyRunningAppRelaunch'. I guess it makes sense that I can’t mix and match between versions of libcef that easily.

Does anyone have suggestions for how to package this successfully? Thanks!