Using clang with buildFHSEnv

I’m trying to get clang working with buildFHSEnv. My ultimate goal is to use bazel to build a cpp project. Bazel uses clang to build the project. The project depends on openssl, sdbus-cpp and curl installed on the system as libraries. This is my flake.nix so far

{
inputs = {
  nixpkgs.url = "github:nixos/nixpkgs/nixos-24.11";
  flake-utils.url = "github:numtide/flake-utils";
};
outputs = {self, nixpkgs, flake-utils}:
  flake-utils.lib.eachDefaultSystem
    (system:
      let
        pkgs = import nixpkgs { inherit system;};
				fhs = pkgs.buildFHSEnv {
					name = "bazel-fhs-shell";
					targetPkgs = pkgs: with pkgs; [
							pkg-config
							llvmPackages.libcxxClang
							curl
							systemd
							sdbus-cpp
							bazel_7
							openssl

						];
					extraOutputsToInstall = ["dev"];
				};
        in with pkgs;
        {
          devShells.default = fhs.env;
        }
    );
}

When I try to build with this, I get errors like

...fatal error: 'atomic' file not found
   45 | #include <atomic>

Afaik, atomic is included in the std library so I think its an issue with the build environment ( I could be wrong since I’m kinda new to building C applications ). gcc worked fine (meaning it doesn’t give errors for basic std library imports but fails due to unknown reasons. The project recommends using clang so now I’m trying to use clang instead of gcc, assuming the issue is with using gcc instead of clang