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svn:author
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kevans
K 8
svn:date
V 27
2020-10-16T15:16:23.363187Z
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V 200
Makefile: add a small blurb about building with gcc xtoolchain

The key details are to install the appropriate flavor of devel/freebsd-gcc9
and pass CROSS_TOOLCHAIN while building.

Suggested by:	kib

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