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    <p><code>byp</code> is your virtualenv? I just did the same thing, though with the system Python 2.6 and had no problems. You can install <code>libjpeg</code> directly into the virtualenv if you want, then you won't have to hack the PIL build script. Here's what I did:</p> <pre><code>% mkvirtualenv foo (foo)% cdvirtualenv (foo)% lftpget http://www.ijg.org/files/jpegsrc.v8c.tar.gz (foo)% tar zxf jpegsrc.v8c.tar.gz (foo)% cd jpeg-8c (foo)% CC="gcc -arch x86_64" ./configure --prefix=$VIRTUAL_ENV (foo)% make install (foo)% cd .. (foo)% pip install PIL (foo)% python Python 2.6.1 (r261:67515, Jun 24 2010, 21:47:49) [GCC 4.2.1 (Apple Inc. build 5646)] on darwin Type "help", "copyright", "credits" or "license" for more information. &gt;&gt;&gt; import _imaging &gt;&gt;&gt; _imaging &lt;module '_imaging' from '/Users/nicholas/LMI/foo/lib/python2.6/site-packages/PIL/_imaging.so'&gt; &gt;&gt;&gt; ^D </code></pre> <p>While <code>_imaging.so</code> got built for <code>i386</code>, <code>ppc</code> and <code>x86_64</code> (because that is how Apple's Python was compiled), <code>libjpeg</code> was compiled for <code>x86_64</code> only because of the flags I gave gcc:</p> <pre><code>(foo)% file lib/libjpeg.8.dylib lib/libjpeg.8.dylib: Mach-O 64-bit dynamically linked shared library x86_64 (foo)% file lib/python2.6/site-packages/PIL/_imaging.so lib/python2.6/site-packages/PIL/_imaging.so: Mach-O universal binary with 3 architectures lib/python2.6/site-packages/PIL/_imaging.so (for architecture i386): Mach-O bundle i386 lib/python2.6/site-packages/PIL/_imaging.so (for architecture ppc7400): Mach-O bundle ppc lib/python2.6/site-packages/PIL/_imaging.so (for architecture x86_64): Mach-O 64-bit bundle x86_64 (foo)% otool -L lib/python2.6/site-packages/PIL/_imaging.so lib/python2.6/site-packages/PIL/_imaging.so: /Users/nicholas/LMI/foo/lib/libjpeg.8.dylib (compatibility version 12.0.0, current version 12.0.0) /opt/local/lib/libz.1.dylib (compatibility version 1.0.0, current version 1.2.5) /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 125.2.1) </code></pre> <p>Because <code>_imaging.so</code> links to <code>libjpeg</code> dynamically, it fails at load time if a dylib is not available with the expected architecture. I was able to provoke something similar to what you saw by running Python as 32-bit:</p> <pre><code>(foo)% arch -i386 python Python 2.6.1 (r261:67515, Jun 24 2010, 21:47:49) [GCC 4.2.1 (Apple Inc. build 5646)] on darwin Type "help", "copyright", "credits" or "license" for more information. &gt;&gt;&gt; import _imaging Traceback (most recent call last): File "&lt;stdin&gt;", line 1, in &lt;module&gt; ImportError: dlopen(/Users/nicholas/LMI/foo/lib/python2.6/site-packages/PIL/_imaging.so, 2): Symbol not found: _jpeg_resync_to_restart Referenced from: /Users/nicholas/LMI/foo/lib/python2.6/site-packages/PIL/_imaging.so Expected in: flat namespace in /Users/nicholas/LMI/foo/lib/python2.6/site-packages/PIL/_imaging.so </code></pre> <p>So I'd check that the architectures of Python, PIL and libjpeg are compatible. It's rather annoying you don't get a better error message though!</p>
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    1. POSnow Leopard, Homebrew python 2.7, virtualenv, libjpeg and PIL = import error
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    1. COI haven't got back to trying this yet ... sorry about no upvote so far.
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