#11686: Race condition in matplotlib mkdir()
------------------------+---------------------------------------------------
   Reporter:  jdemeyer  |          Owner:  tbd          
       Type:  defect    |         Status:  needs_review 
   Priority:  minor     |      Milestone:  sage-4.7.2   
  Component:  packages  |       Keywords:               
Work_issues:            |       Upstream:  N/A          
   Reviewer:            |         Author:  John Palmieri
     Merged:            |   Dependencies:               
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Comment(by leif):

 For whatever reason, I still get
 {{{
 ...
 NOTE: Set SAGE_MATPLOTLIB_GUI to anything but 'no' to try to build the
 Matplotlib GUI.
 Not building any matplotlib graphical backends.
 patching file lib/matplotlib/__init__.py
 patching file lib/matplotlib/finance.py
 patching file lib/matplotlib/texmanager.py
 basedirlist is: ['/home/leif/Sage/sage-4.7.1.rc2/local']
 ============================================================================
 BUILDING MATPLOTLIB
             matplotlib: 1.0.1
                 python: 2.6.4 (r264, Aug 11 2011, 12:43:02)  [GCC 4.5.1]
               platform: linux2

 REQUIRED DEPENDENCIES
                  numpy: 1.5.1
              freetype2: 9.16.3

 OPTIONAL BACKEND DEPENDENCIES
                 libpng: found, but unknown version (no pkg-config)
 ...
 }}}
 i.e. an "unknown" libpng version, even without the patch to `setupext.py`.

-- 
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11686#comment:20>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica, 
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