matplotlib-users Mailing List for matplotlib

On 7/2/2014 11:46 AM, Alan Ezust wrote:
> I am still trying to build matplotlib on windows. The instructions on
> 1717 were very helpful, I managed to build the
> prerequisites manually based on the instructions in the dep_build.cmd
> that came from matplotlib-winbuild project.
>
> But when I try to run it I get this error message:
>
>>>> import matplotlib.pyplot as plt
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> File
> "C:\Python33\lib\site-packages\matplotlib-1.4.x-py3.3-win32.egg\matplotlib\pyplot.py",
> line 27, in <module>
> import matplotlib.colorbar
> File
> "C:\Python33\lib\site-packages\matplotlib-1.4.x-py3.3-win32.egg\matplotlib\colorbar.py",
> line 34, in <module>
> import matplotlib.collections as collections
> File
> "C:\Python33\lib\site-packages\matplotlib-1.4.x-py3.3-win32.egg\matplotlib\collections.py",
> line 27, in <module>
> import matplotlib.backend_bases as backend_bases
> File
> "C:\Python33\lib\site-packages\matplotlib-1.4.x-py3.3-win32.egg\matplotlib\backend_bases.py",
> line 56, in <module>
> import matplotlib.textpath as textpath
> File
> "C:\Python33\lib\site-packages\matplotlib-1.4.x-py3.3-win32.egg\matplotlib\textpath.py",
> line 22, in <module>
> from matplotlib.mathtext import MathTextParser
> File
> "C:\Python33\lib\site-packages\matplotlib-1.4.x-py3.3-win32.egg\matplotlib\mathtext.py",
> line 63, in <module>
> import matplotlib._png as _png
> ImportError: DLL load failed: The specified module could not be found.
>
> I am guessing it doesn't like the filename of the png16.dll file, but
> how do I know what filename it is looking for?
> I noticed I had to rename a bunch of .lib files in order to build
> matplotlib from source, but that was OK since the error message
> said what file it was looking for. How do I determine the correct
> filename to use from here?
>
It's better to use the static libraries for libpng, zlib, and freetype 
(unless you have reasons not to). Rename the .lib files as in the build 
script:
<https://github.com/jbmohler/matplotlib-winbuild/blob/master/build_dep.cmd#L236>
<https://github.com/jbmohler/matplotlib-winbuild/blob/master/build_dep.cmd#L214>
<https://github.com/jbmohler/matplotlib-winbuild/blob/master/build_dep.cmd#L247>
Christoph

I am still trying to build matplotlib on windows. The instructions on 1717
were very helpful, I managed to build the
prerequisites manually based on the instructions in the dep_build.cmd that
came from matplotlib-winbuild project.
But when I try to run it I get this error message:
>>> import matplotlib.pyplot as plt
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File
"C:\Python33\lib\site-packages\matplotlib-1.4.x-py3.3-win32.egg\matplotlib\pyplot.py",
line 27, in <module>
 import matplotlib.colorbar
 File
"C:\Python33\lib\site-packages\matplotlib-1.4.x-py3.3-win32.egg\matplotlib\colorbar.py",
line 34, in <module>
 import matplotlib.collections as collections
 File
"C:\Python33\lib\site-packages\matplotlib-1.4.x-py3.3-win32.egg\matplotlib\collections.py",
line 27, in <module>
 import matplotlib.backend_bases as backend_bases
 File
"C:\Python33\lib\site-packages\matplotlib-1.4.x-py3.3-win32.egg\matplotlib\backend_bases.py",
line 56, in <module>
 import matplotlib.textpath as textpath
 File
"C:\Python33\lib\site-packages\matplotlib-1.4.x-py3.3-win32.egg\matplotlib\textpath.py",
line 22, in <module>
 from matplotlib.mathtext import MathTextParser
 File
"C:\Python33\lib\site-packages\matplotlib-1.4.x-py3.3-win32.egg\matplotlib\mathtext.py",
line 63, in <module>
 import matplotlib._png as _png
ImportError: DLL load failed: The specified module could not be found.
I am guessing it doesn't like the filename of the png16.dll file, but how
do I know what filename it is looking for?
I noticed I had to rename a bunch of .lib files in order to build
matplotlib from source, but that was OK since the error message
said what file it was looking for. How do I determine the correct filename
to use from here?