Collecting matplotlib
  Downloading matplotlib-2.0.0.tar.gz (53.2MB)
    100% |████████████████████████████████| 53.2MB 12.8MB/s 
    Complete output from command python setup.py egg_info:
    ============================================================================
    Edit setup.cfg to change the build options
    
    BUILDING MATPLOTLIB
                matplotlib: yes [2.0.0]
                    python: yes [3.6.0 (default, Jan 25 2017, 17:55:12)  [GCC
                            5.4.0 20160609]]
                  platform: yes [linux]
    
    REQUIRED DEPENDENCIES AND EXTENSIONS
                     numpy: yes [version 1.12.0]
                       six: yes [using six version 1.10.0]
                  dateutil: yes [using dateutil version 2.6.0]
               functools32: yes [Not required]
              subprocess32: yes [Not required]
                      pytz: yes [using pytz version 2016.10]
                    cycler: yes [cycler was not found. pip will attempt to
                            install it after matplotlib.]
                   tornado: yes [tornado was not found. It is required for the
                            WebAgg backend. pip/easy_install may attempt to
                            install it after matplotlib.]
                 pyparsing: yes [pyparsing was not found. It is required for
                            mathtext support. pip/easy_install may attempt to
                            install it after matplotlib.]
                    libagg: yes [pkg-config information for 'libagg' could not
                            be found. Using local copy.]
                  freetype: yes [version 2.6.1]
                       png: yes [version 1.2.54]
                     qhull: yes [pkg-config information for 'qhull' 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  [PyQt5 not found]
                    qt4agg: no  [PySide not found; PyQt4 not found]
                   gtk3agg: yes [installing, unknown (can not use
                            multiprocessing to determine)]
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-tph91xce/matplotlib/setup.py", line 184, in <module>
        result = package.check()
      File "/tmp/pip-build-tph91xce/matplotlib/setupext.py", line 2064, in check
        stderr=subprocess.STDOUT)
      File "/home/bli/lib/python3.6/subprocess.py", line 336, in check_output
        **kwargs).stdout
      File "/home/bli/lib/python3.6/subprocess.py", line 403, in run
        with Popen(*popenargs, **kwargs) as process:
      File "/home/bli/lib/python3.6/subprocess.py", line 707, in __init__
        restore_signals, start_new_session)
      File "/home/bli/lib/python3.6/subprocess.py", line 1260, in _execute_child
        restore_signals, start_new_session, preexec_fn)
    OSError: [Errno 12] Cannot allocate memory
                 gtk3cairo: yes [installing, unknown (can not use
                            multiprocessing to determine)]
                    gtkagg: no  [Requires pygtk]
                     tkagg: yes [installing; run-time loading from Python Tcl /
                            Tk]
                     wxagg: no  [requires wxPython]
                       gtk: no  [Requires pygtk]
                       agg: yes [installing]
                     cairo: no  [cairocffi or pycairo not found]
                 windowing: no  [Microsoft Windows only]
    
    OPTIONAL LATEX DEPENDENCIES
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-tph91xce/matplotlib/