As far as I can tell, one cannot easily use cpptools in visual studio code, due the C# executable. Thus, developing C/C++ is not really possible with VSCode on NixOS.  To work around this, we can use vscode-with-extension and use an overlay to install cpptools via nix:  self: super: {     mycode = super.vscode-with-extensions.override {         # When the extension is already available in the default extensions set.         vscodeExtensions = with super.vscode-extensions; [             ms-vscode...