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

>>13
Who cares about average human intelligence? As long as there are a few groups of elites ensuring our continued technological progress, the rest of humanity can provide a stable base of wage slaves and cannon fodder.