diff --git a/home/default.nix b/home/default.nix
index e26c14f..f8ac8e4 100644
--- a/home/default.nix
+++ b/home/default.nix
@@ -35,6 +35,9 @@
     claude-code
     opencode
 
+    # C++ stdlib for Python venv native extensions
+    pkgs.stdenv.cc.cc.lib
+
     # Custom packages
     (pkgs.callPackage ../pkgs/ax {})
 
diff --git a/home/modules/shell.nix b/home/modules/shell.nix
index 8ffdc5f..1e16e90 100644
--- a/home/modules/shell.nix
+++ b/home/modules/shell.nix
@@ -1,4 +1,4 @@
-{ config, lib, ... }:
+{ config, lib, pkgs, ... }:
 
 {
   programs.fzf = {
@@ -28,6 +28,10 @@
       PROMPT='%F{green}%n@%m%f:%F{blue}%~%f %F{240}''${vcs_info_msg_0_}%f %# '
     '';
 
+    sessionVariables = {
+      LD_LIBRARY_PATH = "${pkgs.stdenv.cc.cc.lib}/lib";
+    };
+
     shellAliases = {
       cat = "bat";
     };
diff --git a/hosts/macvm-nix/default.nix b/hosts/macvm-nix/default.nix
index 8bd905a..c84a65a 100644
--- a/hosts/macvm-nix/default.nix
+++ b/hosts/macvm-nix/default.nix
@@ -8,6 +8,7 @@
 
   networking.hostName = "macvm-nix";
   networking.domain = "";
+  networking.interfaces.enp0s1.mtu = 1400;
 
   # Disko: Auto-partitioning configuration
   disko.devices = {