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(make.info)Canceling Rules

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Canceling Implicit Rules
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   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:

     %.o : %.s