Copyright (c) 2014-2019 Code Synthesis Ltd and the build2 contributors.

For the full list of contributors, see the revision history in version control
system.

The copyright for the code is held by the contributors of the code. The code
is licensed under permissive open source licensing terms (see the accompanying
LICENSE file). When you contribute code to this project, you license it under
these terms. Before contributing please make sure these terms are acceptable
to you (or the organization that employs you) and that you are the author of
the code being contributed.