Add C/C++ libraries for Python venv with compiled packages support

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 {})
 

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";
     };

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 = {

nixos/modules/development.nix

@@ -24,6 +24,14 @@
     selectedPackages =
       lib.concatMap (lang: languagePackages.${lang} or []) cfg.languages;
 
+    # C/C++ libraries needed for compiled Python packages (numpy, etc.)
+    pythonDevLibraries = with pkgs;
+      lib.optionals (lib.elem "python" cfg.languages) [
+        glibc
+        stdenv.cc.cc.lib
+        libxcrypt
+      ];
+
   in lib.mkIf cfg.enable {
 
     # Core development tools
@@ -37,7 +45,16 @@
       cmake
       ripgrep
       jq
-    ] ++ selectedPackages;
+    ] ++ selectedPackages ++ pythonDevLibraries;
+
+    # Set library paths for venv compatibility with compiled packages
+    environment.variables = lib.mkIf (lib.elem "python" cfg.languages) {
+      LD_LIBRARY_PATH = lib.makeLibraryPath (with pkgs; [
+        glibc
+        stdenv.cc.cc.lib
+        libxcrypt
+      ]);
+    };
 
     # Enable container support (optional)
     #virtualisation.docker.enable = true;