10.5.6 Canceling Implicit Rules
You can override a built-in implicit rule (or one you have defined
yourself) by defining a new pattern rule with the same target and
prerequisites, but different commands. When the new rule is defined, the
built-in one is replaced. The new rule's position in the sequence of
implicit rules is determined by where you write the new rule.
You can cancel a built-in implicit rule by defining a pattern rule with the
same target and prerequisites, but no commands. For example, the following
would cancel the rule that runs the assembler:
