ERROR: Complete output from command python setup.py egg_info:
    ERROR: ================================================================================
    Edit setup.cfg to change the build options

    BUILDING MATPLOTLIB
      matplotlib: yes [3.1.0]
          python: yes [3.7.0 (default, Jun 15 2019, 11:55:33)  [GCC 6.3.0 20170516]]
        platform: yes [linux]

    OPTIONAL SUBPACKAGES
     sample_data: yes [installing]
           tests: no  [skipping due to configuration]

    OPTIONAL BACKEND EXTENSIONS
             agg: yes [installing]
           tkagg: yes [installing; run-time loading from Python Tcl/Tk]
          macosx: no  [Mac OS-X only]

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

    running egg_info
    creating pip-egg-info/matplotlib.egg-info
    writing pip-egg-info/matplotlib.egg-info/PKG-INFO
    writing dependency_links to pip-egg-info/matplotlib.egg-info/dependency_links.txt
    writing namespace_packages to pip-egg-info/matplotlib.egg-info/namespace_packages.txt
    writing requirements to pip-egg-info/matplotlib.egg-info/requires.txt
    writing top-level names to pip-egg-info/matplotlib.egg-info/top_level.txt
    writing manifest file 'pip-egg-info/matplotlib.egg-info/SOURCES.txt'
    Traceback (most recent call last):
      File "/usr/local/lib/python3.7/site-packages/numpy/core/__init__.py", line 40, in <module>
        from . import multiarray
      File "/usr/local/lib/python3.7/site-packages/numpy/core/multiarray.py", line 12, in <module>
        from . import overrides
      File "/usr/local/lib/python3.7/site-packages/numpy/core/overrides.py", line 6, in <module>
        from numpy.core._multiarray_umath import (
    ImportError: /lib/arm-linux-gnueabihf/libm.so.6: version `GLIBC_2.27' not found (required by /usr/local/lib/python3.7/site-packages/numpy/core/_multiarray_umath.cpython-37m-arm-linux-gnueabihf.so)

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-fzfq0c6u/matplotlib/setup.py", line 300, in <module>
        cmdclass=cmdclass,
      File "/usr/local/lib/python3.7/site-packages/setuptools/__init__.py", line 129, in setup
        return distutils.core.setup(**attrs)
      File "/usr/local/lib/python3.7/distutils/core.py", line 148, in setup
        dist.run_commands()
      File "/usr/local/lib/python3.7/distutils/dist.py", line 966, in run_commands
        self.run_command(cmd)
      File "/usr/local/lib/python3.7/distutils/dist.py", line 985, in run_command
        cmd_obj.run()
      File "/usr/local/lib/python3.7/site-packages/setuptools/command/egg_info.py", line 278, in run
        self.find_sources()
      File "/usr/local/lib/python3.7/site-packages/setuptools/command/egg_info.py", line 293, in find_sources
        mm.run()
      File "/usr/local/lib/python3.7/site-packages/setuptools/command/egg_info.py", line 524, in run
        self.add_defaults()
      File "/usr/local/lib/python3.7/site-packages/setuptools/command/egg_info.py", line 560, in add_defaults
        sdist.add_defaults(self)
      File "/usr/local/lib/python3.7/distutils/command/sdist.py", line 228, in add_defaults
        self._add_defaults_ext()
      File "/usr/local/lib/python3.7/distutils/command/sdist.py", line 311, in _add_defaults_ext
        build_ext = self.get_finalized_command('build_ext')
      File "/usr/local/lib/python3.7/distutils/cmd.py", line 299, in get_finalized_command
        cmd_obj.ensure_finalized()
      File "/usr/local/lib/python3.7/distutils/cmd.py", line 107, in ensure_finalized
        self.finalize_options()
      File "/tmp/pip-install-fzfq0c6u/matplotlib/setup.py", line 106, in finalize_options
        None, (package.get_extension() for package in good_packages))
      File "/tmp/pip-install-fzfq0c6u/matplotlib/setup.py", line 106, in <genexpr>
        None, (package.get_extension() for package in good_packages))
      File "/tmp/pip-install-fzfq0c6u/matplotlib/setupext.py", line 806, in get_extension
        Numpy().add_flags(ext)
      File "/tmp/pip-install-fzfq0c6u/matplotlib/setupext.py", line 607, in add_flags
        import numpy as np
      File "/usr/local/lib/python3.7/site-packages/numpy/__init__.py", line 142, in <module>
        from . import core
      File "/usr/local/lib/python3.7/site-packages/numpy/core/__init__.py", line 71, in <module>
        raise ImportError(msg)
    ImportError:

    IMPORTANT: PLEASE READ THIS FOR ADVICE ON HOW TO SOLVE THIS ISSUE!

    Importing the multiarray numpy extension module failed.  Most
    likely you are trying to import a failed build of numpy.
    Here is how to proceed:
    - If you're working with a numpy git repository, try `git clean -xdf`
      (removes all files not under version control) and rebuild numpy.
    - If you are simply trying to use the numpy version that you have installed:
      your installation is broken - please reinstall numpy.
    - If you have already reinstalled and that did not fix the problem, then:
      1. Check that you are using the Python you expect (you're using /usr/local/bin/python3.7),
         and that you have no directories in your PATH or PYTHONPATH that can
         interfere with the Python and numpy versions you're trying to use.
      2. If (1) looks fine, you can open a new issue at
         https://github.com/numpy/numpy/issues.  Please include details on:
         - how you installed Python
         - how you installed numpy
         - your operating system
         - whether or not you have multiple versions of Python installed
         - if you built from source, your compiler versions and ideally a build log

         Note: this error has many possible causes, so please don't comment on
         an existing issue about this - open a new one instead.

    Original error was: /lib/arm-linux-gnueabihf/libm.so.6: version `GLIBC_2.27' not found (required by /usr/local/lib/python3.7/site-packages/numpy/core/_multiarray_umath.cpython-37m-arm-linux-gnueabihf.so)

    ----------------------------------------
ERROR: Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-fzfq0c6u/matplotlib/