matplotlib 说它需要 libpng15，但我有 libpng16

Question

问题可能是配置问题，因为在 Mac 上正确安装似乎很棘手。我正在运行 Mavericks 和 matplotlib 1.4.x，但是当我打开 Python 2.7.5 shell 和 import pylib 时，我收到此错误：

>>> import pylab

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Python/2.7/site-packages/matplotlib-1.4.x-py2.7-macosx-10.9-intel.egg/pylab.py", line 1, in <module>
    from matplotlib.pylab import *
  File "/Library/Python/2.7/site-packages/matplotlib-1.4.x-py2.7-macosx-10.9-intel.egg/matplotlib/pylab.py", line 230, in <module>
    import matplotlib.finance
  File "/Library/Python/2.7/site-packages/matplotlib-1.4.x-py2.7-macosx-10.9-intel.egg/matplotlib/finance.py", line 38, in <module>
    from matplotlib.collections import LineCollection, PolyCollection
  File "/Library/Python/2.7/site-packages/matplotlib-1.4.x-py2.7-macosx-10.9-intel.egg/matplotlib/collections.py", line 27, in <module>
    import matplotlib.backend_bases as backend_bases
  File "/Library/Python/2.7/site-packages/matplotlib-1.4.x-py2.7-macosx-10.9-intel.egg/matplotlib/backend_bases.py", line 55, in <module>
    import matplotlib.textpath as textpath
  File "/Library/Python/2.7/site-packages/matplotlib-1.4.x-py2.7-macosx-10.9-intel.egg/matplotlib/textpath.py", line 22, in <module>
    from matplotlib.mathtext import MathTextParser
  File "/Library/Python/2.7/site-packages/matplotlib-1.4.x-py2.7-macosx-10.9-intel.egg/matplotlib/mathtext.py", line 64, in <module>
    import matplotlib._png as _png
ImportError: dlopen(/Library/Python/2.7/site-packages/matplotlib-1.4.x-py2.7-macosx-10.9-intel.egg/matplotlib/_png.so, 2): Library not loaded: /usr/local/lib/libpng15.15.dylib
  Referenced from: /Library/Python/2.7/site-packages/matplotlib-1.4.x-py2.7-macosx-10.9-intel.egg/matplotlib/_png.so
  Reason: image not found

我安装了libpng16，但没有安装libpng15。

Answer 1

我在 _png.so 中看到了对 libpng15 的硬编码引用。
卸载和安装 matplotlib 为我解决了这个问题。

Answer 2

你总是可以通过生成这样的软链接来嘲笑它

sudo ln -s /opt/X11/lib/libpng.dylib /usr/local/lib/libpng15.15.dylib

不是更清洁的解决方案，但我不明白为什么 matplotlib 固执地要求专门针对 libpng15 而不是任何 15 或更大。