[Boost-build] Search path for import

From: Deane Yang (deane_at_[hidden])
Date: 2021-12-30 17:06:28

I'd like to put all my own module files into a separate directory and have
my Jamroot be able to import them. But I can't figure out how to do this.
Is there some way to tell b2 to search a particular directory when
importing a module?