[haiku-development] missing -lm?

One of the things I've seen come up more than once now in attempting
ports is that they bomb out for a missing -lm.
It's my understanding the this refers to libm which is a math library.
 Is this included in one of Haiku's libraries?
And is the workaround to include a Haiku library rather than -lm, and
if so which one is it?

-scottmc

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