1.6.16 (2020-01-23)

        * Allow absolute paths in PRETTY_FILES.

1.6.15 (2019-12-06)

        * Remove redundant libtool m4 libraries.

1.6.14 (2019-07-16)

        * Update MANIFEST to ensure that 'make dist' works correctly.

1.6.13 (2019-07-16)

        * Update coreutils to a newer version s.t. they build cleanly
          on linux systems with GLIBC 2.28 or newer.  Remove the strip
          from install libraries to allow coreutils to be installed on
          Mac OS systems.
	
1.6.12 (2019-06-11)

        * install-headers target now depends on BUILT_SOURCES to
          enable installation of generated headers

1.6.11 (2019-05-23)

        * Changed the bootstrap shebang from sh to bash to address a
          bashism that arrived at 1.6.10.

1.6.10 (2019-05-02)

        * Added additional up-front checks to the bootstrap script to
          ensure required executables are available.

1.6.9 (2019-04-30)

        * Now that both automake and pure make headers and footers are
          co-mingled, address an issues in which the .DEFAULT_GOAL
          specifications in the repos.mak footer were conflicting with
          makefiles that wanted a different default goal by moving
          those .DEFAULT_GOAL specifications to Makefile-bootstrap.

1.6.8 (2019-04-29)

        * Downgraded m4 from 1.4.17 to 1.4.5 since 1.4.5 seems to be the
          last version of m4 that does not abort on invocation in the m4
          *rintf and friends compatibility and portability library.

        * Leverage both automake and pure make headers and footers by
          including the latter in the former.

        * Reworked how verbose progress is handled to simplify
          specification of progress macros.

        * Rebased several automake header macros implementations on their
          pure make equivalents.

1.6.7 (2019-04-26)

        * Addressed issues with NL_FILTERED_CANONICAL in which the desired
          content to be filtered was not filtering correctly and in which
          the desired filtered canonical variables were not emitted in
          makefiles.

1.6.6 (2019-04-09)

        * Added code coverage support for clang, which uses a link flag
          --coverage instead of linking to a library(-lgov) as gcc does
          for code coverage functions.

1.6.5 (2018-11-19)

        * Addressed an issue in which the failure to make the 'repos-warning'
          target order-only caused dependent repo paths to be repeatedly
          and unnecessarily remade which, in turn, caused git operations
          and the configuration or build to fail.

1.6.4 (2018-11-14)

        * Added support for pulling down remote package dependencies using
          git clone (default) or git submodule depending on the setting of
          pull.method in repos.conf.

1.6.3 (2018-10-19)

        * Added support for coverage-local and check-local targets. Added
          documentation for all coverage-related targets.

1.6.2 (2018-10-09)

        * Take a different approach to version flapping against 'make
          distcheck' by leaving VERSION_FILE as an immediate (:=) variable
          and instead creating a two-level <PACKAGE>_VERSION variable, the
          first of which is set from VERSION_FILE by default at make
          recursion level zero (0).

1.6.1 (2018-09-26)

        * Address an issue with VERSION_FILE on clean source code control
          clones or unarchived distribution in which 'make dist' or
          'make distcheck' fail. VERSION_FILE should be and is
          intentionally a deferred (=) rather than an immediate (:=)
          variable to ensure late evaluation AFTER .local-version MAY
          be created rather than when the makefile containing it is
          parsed.

1.6.0 (2018-09-19)

        * Added support to repos.conf for a 'commit' key such that a
          hash or tag other than HEAD for a given repository and
          branch may be synchronized and checked out.

        * Made a minor change to the 'bootstrap' script such that it emits
          the actual action commands that will be executed when the verbose
          flag is asserted.

1.5.3 (2018-09-14)

        * Address a number of issues with building the prepackaged GNU
          autotools subset included in nlbuild-autotools for Ubuntu
          Bionic.

          - Fixed "Unescaped left brace in regex is deprecated" that
            was formerly a warning in Perl 5.22 and is now a hard error
            in Perl 5.26.

          - Address new glibc glob interface changes by upgrading from
            make-3.82 to make-4.1 and applying relevant Ubuntu Bionic
            patches.

        * Add support to the package 'build' script to find and apply
          patches for the above.

1.5.2 (2018-04-26)

        * Since the '--name-only' option only appears in git-2.6 and later
          and there are production systems using git version as old as
          git-1.9, do not use '--name-only' when processing 'repos.conf'.

1.5.1 (2018-04-20)

        * Addressed a number of typos and grammatical errors in comments
          and help output.

1.5.0 (2018-04-19)

        * Added support for pulling down remote package dependencies
          using git submodule.

        * Addressed an issue in which nl_enable_coverage.m4 did not work
          correctly on some Linux distributions by specifying coverage
          libraries under LIBS rather than LDFLAGS.

1.4.4 (2018-02-06)

        * Addressed an issue where 'mkskeleton' failed while trying to
          generate "third_party/Makefile.am".

1.4.3 (2018-02-01)

        * Addressed an issue with NL_{SAVE,RESTORE}_WERROR in which
          -Werror=<specific> was not handled.

1.4.2 (2017-06-20)

	* Addressed an issue with the 'make coverage' target where certain
	  make versions may have sensitivites to trailing slashes in order-
	  only targets.

1.4.1 (2017-06-19)

	* Refactored m4 and autotools auxilliary files to ensure that 
	  third-party content remains under third_party/....
	* Addressed issues with generating distributions on Mac OS X 
	  where GNU software, including wget, is not available in PATH.
	* Addressed issue with missing files in MANIFEST.

1.4 (2017-06-15)

	* Remove package archives and prebuilt in-package binaries.
	* Ensure that GNU tool build process is completely self-sufficient
	  and has no dependencies on installed host binaries.	
	* Add support for generating versioned core and prebuilt package binary
	  distributions.
	* Ensure that 'bootstrap' can work with either prebuilt in-package
	  binaries or with installed host binaries.
	
1.3.1 (2017-05-10)

	* Specify the correct m4 URL.

1.3 (2016-12-05)

	* Added the support for detection of supported C++ version.

1.2.2 (2016-08-29)

	* Use the arguments passed, as designed and intended, to
	  NL_PROG_LNDIR rather than hard-coded values for the GNU cp
	  fallback.

1.2.1 (2016-07-13)

	* Make the 'pretty' and 'pretty-check' targets dependent on
	  $(PRETTY_FILES) and then iterate on a filtered version of $(^) so
	  that make's VPATH engine can be leveraged to find sources and
	  headers that are not in directly stat-able paths listed in
	  $(PRETTY_FILES).

1.2 (2016-06-01)

	* Added support for coding style formatting and checking targets.

1.1.2 (2016-03-19)

	* Improve the code coverage generation process to cover an entire
	  project's source.

1.1.1 (2015-12-10)

	* Properly handle package optionality when using pkg-config to
	  detect external packages.

1.1 (2015-11-10)

	* Added support for a recursive 'install-headers' target to allow
	  packages that wish to leverage it to install their public headers
	  and only their public headers to DESTDIR on 'make install-headers'
	  without performing any additional build actions.

1.0.1 (2015-10-27)

	* Refactored NL_WITH_PACKAGE into NL_WITH_REQUIRED_EXTERNAL_PACKAGE,
	  NL_WITH_OPTIONAL_EXTERNAL_PACKAGE, NL_WITH_REQUIRED_INTERNAL_PACKAGE,
	  and NL_WITH_OPTIONAL_INTERNAL_PACKAGE.

1.0 (2015-03-19)

        * Initial revision with GNU m4 1.4.17, autoconf 2.68, automake 1.14.1,
          libtool 2.4.2, make 3.82, and coreutils 8.21.