KCNHUB: Python/Nvidia: Add packages for pycuda compat (gcc11/cuda inc. path)

machines/kcnhub/nvidia.nix

@@ -37,8 +37,17 @@
   # Add cuda to system environment
   environment.systemPackages = with pkgs; [
     cudatoolkit
+    # Cudatoolkit by default only supports gcc11 for our version
+    gcc11
   ];
 
+  # Some packages (such as pyCuda expect this include path to be exposed)
+  environment.sessionVariables = {
+    CPATH = [
+      "${pkgs.cudatoolkit}/include"
+    ];
+  };
+
   # Use Prebuilt Cached Versions of CUDA Packages
   nix.settings = {
     substituters = [