[build2] "error: failed to extract C++ header search paths"

[Boris Kolpackov]

Hi David,

I think we've figured this one out and fixed it for the next release.
It would be great if you could try the staged toolchain and confirm
it works for you. It's the same installation process, just the install
scripts come from this location:

https://stage.build2.org/0/

And thanks for the report!

Boris