python -m pip install matplotlib==3.0.3
Actual outcome
Collecting matplotlib (from -r ./build/functional-test-requirements.txt (line 5))
  Downloading https://files.pythonhosted.org/packages/1e/20/2032ad99f0dfe0f60970941af36e8d0942d3713f442bb3df37ac35d67358/matplotlib-2.2.4.tar.gz (37.0MB)
    Complete output from command python setup.py egg_info:
    ============================================================================
    Edit setup.cfg to change the build options
    BUILDING MATPLOTLIB
                matplotlib: yes [2.2.4]
                    python: yes [2.7.14 (v2.7.14:84471935ed, Sep 16 2017,
                            20:25:58) [MSC v.1500 64 bit (AMD64)]]
                  platform: yes [win32]
    REQUIRED DEPENDENCIES AND EXTENSIONS
                     numpy: yes [version 1.16.2]
          install_requires: yes [handled by setuptools]
                    libagg: yes [pkg-config information for 'libagg' could not
                            be found. Using local copy.]
                  freetype: no  [The C/C++ header for freetype
                            (freetype2\ft2build.h) could not be found.  You may
                            need to install the development package.]
                       png: no  [The C/C++ header for png (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]
                     tests: no  [skipping due to configuration]
            toolkits_tests: no  [skipping due to configuration]
    OPTIONAL BACKEND EXTENSIONS
                    macosx: no  [Mac OS-X only]
                    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  [Requires pygtk]
                     tkagg: yes [installing; run-time loading from Python Tcl /
                     wxagg: no  [requires wxPython]
                       gtk: no  [Requires pygtk]
                       agg: yes [installing]
                     cairo: no  [cairocffi or pycairo not found]
                 windowing: yes [installing]
    OPTIONAL LATEX DEPENDENCIES
                    dvipng: no
               ghostscript: no
                     latex: no
                   pdftops: no
    OPTIONAL PACKAGE DATA
                      dlls: no  [skipping due to configuration]
    ============================================================================
                            * The following required packages can not be built:
                            * freetype, png
                            * Please check http://gnuwin32.sourceforge.net/packa
                            * ges/freetype.htm for instructions to install
                            * freetype
                            * Please check http://gnuwin32.sourceforge.net/packa
                            * ges/libpng.htm for instructions to install png
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in c:\users\vssadm~1\appdata\local\temp\pip-install-lkfxm9\matplotlib\
Expected outcome
Matplotlib is installed without incident.
Matplotlib version
Operating system: Windows 10
Matplotlib version: 3.0.3
Matplotlib backend (print(matplotlib.get_backend())):
Python version: 2.7, 3.5, 3.6, 3.7
Jupyter version (if applicable): 1.0.0
Other libraries:
See our extension's CI output for more detail if you wish here.
          
@d3r3kk can you confirm that this is woking now?  The windows wheels are listed at https://pypi.org/project/matplotlib/#files
I am going to close, but please ping to have reopened if it is not fixed.