installing libjpeg for pil and Google app engine on mac Mountain Lion
Question: I'm sure there's a duplicate of this somewhere out there but I looked and am
about at the end of my rope. I'm trying get PIL working on my mac OS X 10.8 so
that I can use `dev_appserver.py` to test an imaging feature. First I had
trouble installing PIL until I got Homebrew and installed it using `brew
install pil`. I was under the opinion that brew installed all the necessary
dependencies but when I tried to resize a jpeg in my app, it says `IOError:
decoder jpeg is not available`. So I looked online and most places said I
needed to (1) uninstall PIL, (2) install libjpeg from source and (3) reinstall
PIL. So, I `brew uninstall PIL`, and then

    
    
    curl -O www.ijg.org/files/jpegsrc.v7.tar.gz
    tar zxvf jpegsrc.v7.tar.gz
    cd jpeg-7d/
    ./configure
    make
    make install
    

and finally `brew install pil`. I restart dev_appserver.py and reload the page
on localhost, but same error. I tested pil out from the `python` command-line
with

    
    
    >>> from PIL.Image import Image
    >>> f = open("someimagefile", "rb")
    >>> i = Image()
    >>> i.fromstring(f.read(), decoder_name="jpeg")
    Traceback blah blah blah
    IOError: decoder jpeg not available
    

I don't have much experience installing utilities from command-line, so I
probably missed something obvious. Again, sorry if there are duplicates, but
like I said, I looked and couldn't find anything that seemed to work.


Answer: Finally got it working! Thanks to @zgoda and this
[link](https://sites.google.com/site/asidoothings/python-pil). Here are the
steps I ended up with for those of you who have the same problem:

First make sure PIL is not installed. Download libjpeg from
<http://www.ijg.org/files/jpegsrc.v8c.tar.gz>, unpacked it, `./configure`, and
`make`. When I tried to `make install` it couldn't find the directory to store
the man pages so installation failed. I looked at the information on the above
link and decided to

`cp -r ~/Downloads/jpeg-6d/ /usr/local/jpeg`

I suspect if the installation goes fine than that line isn't necessary.

Then edit the following line in PIL's setup.py:

    
    
    JPEG_ROOT = None
    

to

    
    
    JPEG_ROOT = "/usr/local/jpeg"
    

finally:

    
    
    $ python setup.py build
    $ python setup.py install
    

