Another build failure (seemingly at the same spot).  The log file is 
attached.

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Found local metadata for matplotlib-2.2.4.p0
Using cached file /Users/salis1bt/sage-git/upstream/matplotlib-2.2.4.tar.bz2
matplotlib-2.2.4.p0
====================================================
Setting up build directory for matplotlib-2.2.4.p0
Finished extraction
Applying patches from ../patches...
Applying ../patches/install-jquery-ui.patch
patching file setupext.py
Applying ../patches/python38.patch
patching file setup.py
Applying ../patches/setup.py.patch
patching file setup.py
Hunk #1 succeeded at 67 (offset -18 lines).
****************************************************
Host system:
Darwin mth153844pe212 18.7.0 Darwin Kernel Version 18.7.0: Tue Aug 20 16:57:14 
PDT 2019; root:xnu-4903.271.2~2/RELEASE_X86_64 x86_64
****************************************************
C compiler: clang
C compiler version:
Apple LLVM version 10.0.1 (clang-1001.0.46.4)
Target: x86_64-apple-darwin18.7.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
****************************************************
Package 'matplotlib' is currently not installed
No legacy uninstaller found for 'matplotlib'; nothing to do
NOTE: Set SAGE_MATPLOTLIB_GUI to anything but 'no' to try to build the 
Matplotlib GUI.
Not building any matplotlib graphical backends.
Installing matplotlib-2.2.4.p0
Installing package matplotlib using pip2
Waiting for shared lock to run /Users/salis1bt/sage-git/local/bin/python2 -m 
pip install --ignore-installed --verbose --no-deps --no-index --isolated 
--no-build-isolation 
--root=/Users/salis1bt/sage-git/local/var/tmp/sage/build/matplotlib-2.2.4.p0/inst
 . ... ok
Ignoring indexes: https://pypi.org/simple
Created temporary directory: 
/private/var/folders/d0/bbf0zvnn43b4_fhtkznp_yyc0000gp/T/pip-ephem-wheel-cache-oNzjr7
Created temporary directory: 
/private/var/folders/d0/bbf0zvnn43b4_fhtkznp_yyc0000gp/T/pip-req-tracker-dHGWmX
Created requirements tracker 
'/private/var/folders/d0/bbf0zvnn43b4_fhtkznp_yyc0000gp/T/pip-req-tracker-dHGWmX'
Created temporary directory: 
/private/var/folders/d0/bbf0zvnn43b4_fhtkznp_yyc0000gp/T/pip-install-qEM64Y
Processing 
/Users/salis1bt/sage-git/local/var/tmp/sage/build/matplotlib-2.2.4.p0/src
  Created temporary directory: 
/private/var/folders/d0/bbf0zvnn43b4_fhtkznp_yyc0000gp/T/pip-req-build-MO0CpL
  Added 
file:///Users/salis1bt/sage-git/local/var/tmp/sage/build/matplotlib-2.2.4.p0/src
 to build tracker 
'/private/var/folders/d0/bbf0zvnn43b4_fhtkznp_yyc0000gp/T/pip-req-tracker-dHGWmX'
  Running setup.py 
(path:/private/var/folders/d0/bbf0zvnn43b4_fhtkznp_yyc0000gp/T/pip-req-build-MO0CpL/setup.py)
 egg_info for package from 
file:///Users/salis1bt/sage-git/local/var/tmp/sage/build/matplotlib-2.2.4.p0/src
    Running command python setup.py egg_info
    ============================================================================
    Edit setup.cfg to change the build options

    BUILDING MATPLOTLIB
                matplotlib: yes [2.2.4]
                    python: yes [2.7.15 (default, Oct  1 2019, 13:49:17)  [GCC
                            4.2.1 Compatible Apple LLVM 10.0.1
                            (clang-1001.0.46.4)]]
                  platform: yes [darwin]

    REQUIRED DEPENDENCIES AND EXTENSIONS
                     numpy: yes [version 1.16.1]
          install_requires: yes [handled by setuptools]
                    libagg: yes [pkg-config information for 'libagg' could not
                            be found. Using local copy.]
                  freetype: yes [version 2.9.1]
                       png: no  [The C/C++ header for libpng (png.h) could not
                            be found.  You may need to install the development
                            package.]
                     qhull: yes [pkg-config information for 'libqhull' could not
                            be found. Using local copy.]

    OPTIONAL SUBPACKAGES
               sample_data: yes [installing]
                  toolkits: yes [installing]

    OPTIONAL BACKEND EXTENSIONS
                    macosx: no  [skipping due to configuration]
                    qt5agg: no  [PySide2 not found; PyQt5 not found]
                    qt4agg: no  [PySide not found; PyQt4 not found]
                   gtk3agg: no  [Requires pygobject to be installed.]
                 gtk3cairo: no  [Requires cairocffi or pycairo to be installed.]
                    gtkagg: no  [skipping due to configuration]
                     tkagg: yes [installing; run-time loading from Python Tcl /
                            Tk]
                     wxagg: no  [skipping due to configuration]
                       gtk: no  [skipping due to configuration]
                       agg: yes [installing]
                     cairo: no  [cairocffi or pycairo not found]
                 windowing: no  [skipping due to configuration]

    OPTIONAL LATEX DEPENDENCIES
                    dvipng: yes [version 1.16]
               ghostscript: yes [version 9.27]
                     latex: yes [version 3.14159265]
                   pdftops: no

    OPTIONAL PACKAGE DATA
                      dlls: no  [skipping due to configuration]

    ============================================================================
                            * The following required packages can not be built:
                            * png
                            * Try installing png with `brew install libpng` and
                            * pkg-config with `brew install pkg-config`
Cleaning up...
  Removing source in 
/private/var/folders/d0/bbf0zvnn43b4_fhtkznp_yyc0000gp/T/pip-req-build-MO0CpL
Removed 
file:///Users/salis1bt/sage-git/local/var/tmp/sage/build/matplotlib-2.2.4.p0/src
 from build tracker 
'/private/var/folders/d0/bbf0zvnn43b4_fhtkznp_yyc0000gp/T/pip-req-tracker-dHGWmX'
Removed build tracker 
'/private/var/folders/d0/bbf0zvnn43b4_fhtkznp_yyc0000gp/T/pip-req-tracker-dHGWmX'
Command "python setup.py egg_info" failed with error code 1 in 
/private/var/folders/d0/bbf0zvnn43b4_fhtkznp_yyc0000gp/T/pip-req-build-MO0CpL/
Exception information:
Traceback (most recent call last):
  File 
"/Users/salis1bt/sage-git/local/lib/python2.7/site-packages/pip/_internal/cli/base_command.py",
 line 143, in main
    status = self.run(options, args)
  File 
"/Users/salis1bt/sage-git/local/lib/python2.7/site-packages/pip/_internal/commands/install.py",
 line 318, in run
    resolver.resolve(requirement_set)
  File 
"/Users/salis1bt/sage-git/local/lib/python2.7/site-packages/pip/_internal/resolve.py",
 line 102, in resolve
    self._resolve_one(requirement_set, req)
  File 
"/Users/salis1bt/sage-git/local/lib/python2.7/site-packages/pip/_internal/resolve.py",
 line 256, in _resolve_one
    abstract_dist = self._get_abstract_dist_for(req_to_install)
  File 
"/Users/salis1bt/sage-git/local/lib/python2.7/site-packages/pip/_internal/resolve.py",
 line 209, in _get_abstract_dist_for
    self.require_hashes
  File 
"/Users/salis1bt/sage-git/local/lib/python2.7/site-packages/pip/_internal/operations/prepare.py",
 line 298, in prepare_linked_requirement
    abstract_dist.prep_for_dist(finder, self.build_isolation)
  File 
"/Users/salis1bt/sage-git/local/lib/python2.7/site-packages/pip/_internal/operations/prepare.py",
 line 126, in prep_for_dist
    self.req.run_egg_info()
  File 
"/Users/salis1bt/sage-git/local/lib/python2.7/site-packages/pip/_internal/req/req_install.py",
 line 473, in run_egg_info
    command_desc='python setup.py egg_info')
  File 
"/Users/salis1bt/sage-git/local/lib/python2.7/site-packages/pip/_internal/utils/misc.py",
 line 705, in call_subprocess
    % (command_desc, proc.returncode, cwd))
InstallationError: Command "python setup.py egg_info" failed with error code 1 
in 
/private/var/folders/d0/bbf0zvnn43b4_fhtkznp_yyc0000gp/T/pip-req-build-MO0CpL/
Error: installing with pip2 failed
********************************************************************************
Error installing matplotlib-2.2.4.p0
********************************************************************************

real    6m15.677s
user    0m1.481s
sys     0m2.063s
************************************************************************
Error installing package matplotlib-2.2.4.p0
************************************************************************
Please email sage-devel (http://groups.google.com/group/sage-devel)
explaining the problem and including the log file
  /Users/salis1bt/sage-git/logs/pkgs/matplotlib-2.2.4.p0.log
Describe your computer, operating system, etc.
If you want to try to fix the problem yourself, *don't* just cd to
/Users/salis1bt/sage-git/local/var/tmp/sage/build/matplotlib-2.2.4.p0 and type 
'make' or whatever is appropriate.
Instead, the following commands setup all environment variables
correctly and load a subshell for you to debug the error:
  (cd '/Users/salis1bt/sage-git/local/var/tmp/sage/build/matplotlib-2.2.4.p0' 
&& '/Users/salis1bt/sage-git/sage' --sh)
When you are done debugging, you can type "exit" to leave the subshell.
************************************************************************

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