Re: [Matplotlib-users] Failed pip install on OSX

[Scott L. <sl...@sp...>]

On Aug 5, 2013, at 4:43 PM, Matthew Brett <mat...@be...> wrote:

> Hi,
> 
> On Sun, Aug 4, 2013 at 7:26 PM, Scott Lasley <sl...@sp...> wrote:
>> 
>> On Aug 4, 2013, at 4:47 PM, Matthew Brett <mat...@be...> wrote:
>> 
>>> Hi,
>>> 
>>> Congratulations on the new release.
>>> 
>>> I just tried installing in a fresh installation of Python 2.7 from Python.org
>>> 
>>> Am I right in thinking the recommended method is:
>>> 
>>>   pip install matplotlib
>>> 
>>> ?  I did this, and then:
>>> 
>>>>>> import matplotlib.pyplot as plt
>>> Traceback (most recent call last):
>>> File "<stdin>", line 1, in <module>
>>> File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/pyplot.py",
>>> line 24, in <module>
>>>   import matplotlib.colorbar
>>> File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/colorbar.py",
>>> line 29, in <module>
>>>   import matplotlib.collections as collections
>>> File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/collections.py",
>>> line 23, in <module>
>>>   import matplotlib.backend_bases as backend_bases
>>> File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/backend_bases.py",
>>> line 50, in <module>
>>>   import matplotlib.textpath as textpath
>>> File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/textpath.py",
>>> line 14, in <module>
>>>   from matplotlib.mathtext import MathTextParser
>>> File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/mathtext.py",
>>> line 62, in <module>
>>>   import matplotlib._png as _png
>>> ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/_png.so,
>>> 2): Library not loaded: /usr/X11/lib/libpng12.0.dylib
>>> Referenced from:
>>> /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/_png.so
>>> Reason: Incompatible library version: _png.so requires version
>>> 42.0.0 or later, but libpng12.0.dylib provides version 36.0.0
>>> 
>>> There were no previous versions of matplotlib installed.  This on OSX 10.6:
>>> 
>>> Python 2.7.5  just installed from python.org
>>> X11 installed from the Apple installation disks for 10.6 before `pip
>>> install matplotlib`
>>> No homebrew etc
>>> 
>>> Any hints about how I should debug this further?
>>> 
>>> Thanks a lot for any help,
>>> 
>>> Matthew
>> 
>> I was able to install numpy 1.7.1 and matplotlib 1.30 under OS X 10.6.8 with X11 version XQuartz 2.3.6 (xorg-server 1.4.2-apple56) and python 2.7.5 64-bit from python.org using pip 1.4.
>> 
>> Have you tried running Software Update?  If you installed X11 after updating to 10.6.8 you can run the combo updater ( http://support.apple.com/kb/DL1399 ) to get the latest X11.   Alternately, you could try installing XQuartz from http://xquartz.macosforge.org/landing/
> 
> Yes, the system was up to date before I installed matplotlib.   Just
> to check my failing memory, I checked for updates (none), reinstalled
> and got the same answer.
> 
> The combo updater looks like it's a fast track to the same outcome as
> Software update - is it something different?

I don't remember if Software Update detects updates to X11.  What version of X11 are you running?  The version on the Snow Leopard install disks, 2.3.4, is older than version 2.3.6 installed by the combo updater.  As far as I know there is no standalone X11 2.3.6 updater for Snow Leopard.  You'll have to re-install the security updates that came out after the combo updater was released if you use it, which is a bit of a pain.  According to otool -L, the libpng12.0.dylib installed with X11 2.3.6 is version 45, compatibility version 45, so it should work with matplotlib.

If you don't want to run the combo updater because of possible side effects or install XQuartz you can download libpng from http://sourceforge.net/projects/libpng/files/libpng15/1.5.17/, unpack it and do the standard ./configure, make, sudo make install to install it in /usr/local/lib.  setup.py should find it there.

hth,
Scott

> If Matplotlib is only expected to work for the Quartz installs - is it
> worth trying to detect that and warn / error at install time?
> 
> Cheers,
> 
> Matthew