py27-matplotlib @1.2.0 +python import error

[CK171080@…]

I am using MacPorts on OS X 10.8 (Mountain Lion) and XCode 4.6.1. I am encountering problems with matplotlib and I have not found any solution browsing existing bug reports and the internet. Maybe there is someone around who can help...

I installed py27-matplotlib without any compilation error. However when trying to import matplotlib.pyplot in ipython (also installed via macports) I get the following error:

In [1]: import matplotlib.pyplot as plt
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-eff513f636fd> in <module>()
----> 1 import matplotlib.pyplot as plt

/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/pyplot.py in <module>()
     95 
     96 from matplotlib.backends import pylab_setup
---> 97 _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
     98 
     99 @docstring.copy_dedent(Artist.findobj)

/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/backends/__init__.pyc in pylab_setup()
     23         backend_name = 'matplotlib.backends.%s'%backend_name.lower()
     24     backend_mod = __import__(backend_name,
---> 25                              globals(),locals(),[backend_name])
     26 
     27     # Things we pull in from all backends

/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/backends/backend_macosx.py in <module>()
     19 
     20 import matplotlib
---> 21 from matplotlib.backends import _macosx
     22 
     23 

ImportError: dlopen(/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/matplotlib/backends/_macosx.so, 2): Symbol not found: __cg_jpeg_resync_to_restart
  Referenced from: /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO
  Expected in: /opt/local/lib/libjpeg.9.dylib
 in /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO

I get the same error using the normal macports python. I also get the same error message trying to import Tkinter in python/ipython.

Anybody having an idea what's going on?

[seanfarley (Sean Farley)]

Hmmm, I can import both just fine. Maybe do a port -v selfupdate && port -v upgrade outdated?

[anddam (Andrea D'Amore)]

There are several old references to the same issue with different ports both in Trac and mailing lists' archive, try checking those.