prolog-program-name

prolog-program-name is a variable defined in `prolog.el'.
Its value is shown below.

Documentation:
Alist of program names for invoking an inferior Prolog with `run-prolog'.

You can customize this variable.

Value:

(((getenv "EPROLOG")
  (eval
   (getenv "EPROLOG")))
 (eclipse "eclipse")
 (mercury nil)
 (sicstus "sicstus")
 (swi "pl")
 (gnu "gprolog")
 (t "prolog"))