byacc(1) on FreeBSD
The text 46e0dbad2bb6, as FreeBSD 10.0-RELEASE shipped it.
an LALR(1) parser generator
Flags it lists
-
-P -
-V -
-b -
-d -
-g -
-i -
-l -
-o -
-p -
-r -
-s -
-t -
-v -
-y