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 1

PIL did not found libjpeg headers during compilation. Consult your build system documentation on how to specify headers ("includes") location, eg. as environment variables.

Answer 2

Finally got it working! Thanks to @zgoda and this link. 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