or perhaps this rather means that Sage's freetype package was not 
(properly) installed.
Do you have SAGE_ROOT/local/include/freetype2/ft2build.h ?

On Tuesday, June 20, 2017 at 2:48:59 PM UTC+1, Dima Pasechnik wrote:
>
> try
>
> apt-get install libfreetype6-dev
>
>
> On Tuesday, June 20, 2017 at 1:20:34 PM UTC+1, Thierry Coulbois wrote:
>>
>> Here is what I get
>>
>> 17N68:~> cd 
>> '/home/coulbois/programmes/sage/cmi-sage/local/var/tmp/sage/build/matplotlib-1.5.1.p0/src'
>>  
>> && '/home/coulbois/programmes/sage/cmi-sage/sage' --python setup.py --name
>>
>> ============================================================================
>> Edit setup.cfg to change the build options
>>
>> BUILDING MATPLOTLIB
>>             matplotlib: yes [1.5.1]
>>                 python: yes [2.7.13 (default, Jun 15 2017, 16:43:35)  [GCC
>>                         5.4.0]]
>>               platform: yes [linux2]
>>
>> REQUIRED DEPENDENCIES AND EXTENSIONS
>>                  numpy: yes [version 1.11.1]
>>               dateutil: yes [using dateutil version 2.5.3]
>>                   pytz: yes [using pytz version 2016.4]
>>                 cycler: yes [using cycler version 0.10.0]
>>                tornado: yes [using tornado version 4.3]
>>              pyparsing: yes [using pyparsing version 2.1.5]
>>                 libagg: yes [pkg-config information for 'libagg' could not
>>                         be found. Using local copy.]
>>               freetype: no  [The C/C++ header for freetype2 (ft2build.h)
>>                         could not be found.  You may need to install the
>>                         development package.]
>>                    png: yes [version 1.2.51]
>>                  qhull: yes [pkg-config information for 'qhull' 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  [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: no  [skipping due to configuration]
>>                  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: no
>>            ghostscript: yes [version 9.18]
>>                  latex: yes [version 3.14159265]
>>                pdftops: yes [version 0.41.0]
>>
>> OPTIONAL PACKAGE DATA
>>                   dlls: no  [skipping due to configuration]
>>
>>
>> ============================================================================
>>                         * The following required packages can not be 
>> built:
>>                         * freetype
>>
>>

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