build: Exclude CC library in Nix shell for Linux

.envrc

@@ -2,8 +2,8 @@ if ! has nix_direnv_version || ! nix_direnv_version 2.2.1; then
   source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/2.2.1/direnvrc" "sha256-zelF0vLbEl5uaqrfIzbgNzJWGmLzCmYAkInj/LNxvKs="
 fi
 
-nix_direnv_watch_file flake.nix
-nix_direnv_watch_file flake.lock
+watch_file flake.nix
+watch_file flake.lock
 if ! use flake . --impure; then
   echo "devenv could not be built. The devenv environment was not loaded. Make the necessary changes to devenv.nix and hit enter to try again." >&2
 fi

flake.nix

@@ -35,6 +35,8 @@
       forEachSystem
       (system: let
         pkgs = nixpkgs.legacyPackages.${system};
+        lib = pkgs.lib;
+        isDarwin = lib.strings.hasSuffix "darwin" system;
       in {
         default = devenv.lib.mkShell {
           inherit inputs pkgs;
@@ -45,7 +47,7 @@
               config,
               ...
             }: {
-              packages = with pkgs; [pre-commit poethepoet jupyter stdenv.cc.cc.lib zlib];
+              packages = with pkgs; [pre-commit poethepoet jupyter zlib] ++ lib.optionals isDarwin [stdenv.cc.cc.lib];
 
               env = {
                 QIBOLAB_PLATFORMS = (dirOf config.env.DEVENV_ROOT) + "/qibolab_platforms_qrc";