[build2] Using build2 packages installed by bpkg

[Boris Kolpackov]

Markus Pawellek <markuspawellek at gmail.com> writes:

> Is there some kind of flag to automatically make the configuration use
> system-installed packages for all dependencies which are already
> installed and meeting the version constraint?

Not yet. That would require to actually query system package managers
for the availability of packages, their versions, etc., which we want
to support at some point.


> > It's also not unreasonable to want to use such packages directly
> > from the build configuration without first installing them, And
> > this won't work as smoothly. So at some point we may want to
> > consider supporting "overlay configuration" or some such.
> 
> Would this be the same feature as the 'export(PACKAGE ...)'
> functionality of CMake?

Seems so (I am not an expert on CMake) except that I don't think
we will need to create any extra files.