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

>>9
Homo neanderthalensis is a different species entirely and yes it would. It's unlikely that any human selected before ~30,000 years ago could learn any programming language, whereas one selected after this point could almost certainly learn any programming language that a normal person can, provided they were young enough to be taught all of the prerequisites in logical thinking.