What language cavemen could program in?

C/C++ syntax is quite unforgiving for mistakes, and cavemen weren't good abstract thinkers.
I think something like a variant of LISP or Forth could be used to teach a cavemen basic programming.
Haskell or restricted subset of it, would look like pseudocode and could be more palatable to primitive cavemen

>>10
Assuming the generally-preached theories are right.

Neanderthals were smarter than you or me. Hell, even medieval people had greater capacity for learning and thinking. The average human intellect has been degrading as a consequence of developing communication technologies.