antlr-tool-version

antlr-tool-version is a variable defined in `antlr-mode.el'.
Its value is

20701

Documentation:
The version number of the Antlr tool.
The value is an integer of the form XYYZZ which stands for vX.YY.ZZ.
This variable is used to warn about non-supported options and to supply
version correct option values when using M-x antlr-insert-option.

Don't use a number smaller than 20600 since the stored history of
Antlr's options starts with v2.06.00, see `antlr-options-alists'. You
can make this variable buffer-local.

You can customize this variable.