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If you are reading this in the git repository, the contents
refer to *unreleased* changes since the last SCons release.
Past official release announcements appear at:

    https://scons.org/tag/releases.html

==================================================================

A new SCons release, 4.5.1, is now available on the SCons download page:

    https://scons.org/pages/download.html


Here is a summary of the changes since 4.5.0:

NEW FUNCTIONALITY
-----------------

- List new features (presumably why a checkpoint is being released)

DEPRECATED FUNCTIONALITY
------------------------

- List anything that's been deprecated since the last release

CHANGED/ENHANCED EXISTING FUNCTIONALITY
---------------------------------------

- List modifications to existing features, where the previous behavior
  wouldn't actually be considered a bug

FIXES
-----

- Fix a problem in 4.5.0 where using something like the following code
  will cause a Clone()'d environment to share the CPPDEFINES with the
  original Environment() which was cloned. Causing leakage of changes
  to CPPDEFINES when they should be completely independent after the Clone.
      env=Environment(CPPDEFINES=['a'])
      env.Append(CPPDEFINES=['b']) (or AppendUnique,Prepend,PrependUnique)
      env1=env.Clone()
      env1.Append(CPPDEFINES=['c']) (or any other modification, but not overwriting CPPDEFINES)
  Now env['CPPDEFINES'] will contain 'c' when it should not.



IMPROVEMENTS
------------

- List improvements that wouldn't be visible to the user in the
  documentation:  performance improvements (describe the circumstances
  under which they would be observed), or major code cleanups

PACKAGING
---------

- List changes in the way SCons is packaged and/or released

DOCUMENTATION
-------------

- List any significant changes to the documentation (not individual
  typo fixes, even if they're mentioned in src/CHANGES.txt to give
  the contributor credit)

DEVELOPMENT
-----------

- List visible changes in the way SCons is developed

Thanks to the following contributors listed below for their contributions to this release.
==========================================================================================
.. code-block:: text

    git shortlog --no-merges -ns 4.0.1..HEAD