prolog-system-version

prolog-system-version is a variable defined in `prolog.el'.
Its value is shown below.

Documentation:
Alist of Prolog system versions.
The version numbers are of the format (Major . Minor).

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.

Value:

((sicstus
  (3 . 6))
 (swi
  (0 . 0))
 (mercury
  (0 . 0))
 (eclipse
  (3 . 7))
 (gnu
  (0 . 0)))