Migrate config from dotfiles

modules/dev/cc.nix

@@ -0,0 +1,20 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+with lib.my;
+let cfg = config.modules.dev.cc;
+in {
+  options.modules.dev.cc = {
+    enable = mkBoolOpt false;
+  };
+
+  config = mkIf cfg.enable {
+    user.packages = with pkgs; [
+      clang
+      gcc
+      gdb
+      cmake
+      llvmPackages.libcxx
+    ];
+  };
+}