use of \caesura requires \include "gregorian.ly", according to the Notation Reference

[Kenneth Wolcott]

Hi;

I see that the use of \caesura requires \include "gregorian.ly",
according to the Notation Reference.

But doing this completely screws up all the default display Lilypond
code that I've been using all along.

I'm trying to engrave "Somewhere Over the Rainbow", which definitely
does not belong in the Gregorian time period or style.

Yet this piece of music does have two instances of a caesura.

Is there a solution to this conundrum?  Can I safely cherry pick the
definition of the caesura out of the "gregorian.ly" file?

Thanks,
Ken Wolcott