[Image-SIG] Installing libjpeg

[Fredrik Lundh]

PIL's setup.py script (which uses Python's standard "distutils" build
mechanisms) work the same was as the venerable "make" utility (1);
that is, if a target exists and is newer than the source files, it's
assumed to be correct.  This is great when you change only a few
source files, but less great when you change the configuration but not
the source...

Distutils provides a "clean" command that removes old stuff, and
there's also a --force option to install that's supposed to force a
full rebuild.  Looks like neither of these are explained in the
generic Python "installing python modules" documentation (2), so I
guess I should add something to the README about this.

</F>

1) http://en.wikipedia.org/wiki/Make_(software)
2) http://docs.python.org/install/index.html

On Sat, May 22, 2010 at 12:29 AM, Mark Twenhafel <chollapete at gmail.com> wrote:
> Hi--
>
> I just wanted to close out this thread, for the benefit of anyone reading
> the archives in the future.
>
> The problem was solved by following Chris Barker's advice/observation that
> the files "site-packages/PIL/_imaging*.so" needed to be deleted and then the
> PIL package rebuilt.  That is exactly what I did, and PIL is now working.
> The wildcard "_imaging*.so" matched the four shared-object files seen in the
> listing, shown in my earlier post.  I deleted those four files and then
> rebuilt them by executing "python setup.py install" in the Imaging-1.1.7
> directory.
>
> Apparently, the install script doesn't delete these files if they already
> exist; unfortunately, they had been linked to a version of libjpeg that
> didn't work on my box.  Deleting and rebuilding the four "_imaging*.so"
> files allowed the new shared-object files to link to the new version of
> libjpeg that I had installed, which *does* work on my box.
>
> Thanks to Chris, and to Fredrik for his earlier assistance.  Hope I haven't
> clogged up too much bandwidth with my novice-level approach.
>
> Mark T.
>
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