Require m4_ prefix from within the file?

Hi;

Invoking $m4 -P <filename> will require m4_ prepended to
builtins, like m4_define.

Is there any m4 command I can put inside the file to have the same
effect, so that users don't need to remember to invoke m4 with the -P
command line argument? Some of our m4 files use m4_define, some just
define; it would be convenient if the scripts didn't have to know which
was which, and let the file itself determine it.

Thanks,

Paul

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