I've just installed Esenthel Engine on Ubuntu 22.04.3 (64-bit) via Steam.
Then made double click on 'Tutorials' row in 'Projects'.
In the left pane (with Tree) I've checked '1 - Basic App' checkbox then opened this directory and selected 'Main'.
Code appeared in the right hand side window.
Then I tried to build and run using F5 and got the next:
/home/pc/.local/share/Steam/steamapps/common/Esenthel/Bin/EsenthelEngine/_/headers.h:21:13: fatal error: 'new' file not found
#include <new>
^~~~~
1 error generated.

Tried to clean (Ctrl+Alt+F7) and rebuild, but same problem.
What am I doing wrong?

Maybe try installing all packages
https://esenthel.com/?id=doc#Installation