License
======

Sourceforge does not appear to host the current development of
libjpeg, and seems to have caused us unnecessary worry about the
license. The SF site has version 6b, which is 6 years behind Guido
Vollbeding's version 9a. (I think SF may have trouble displaying licenses
that aren't from a standard short list, so ended up with the wrong one.)

Version 9a is at http://ijg.org/

Whether from Sourceforge or IJG or from Squeak's own repository[1],
the license is not GPL. It is this custom but liberal license:

http://directory.fsf.org/wiki?title=License:JPEG

I am not a lawyer. I can't imagine incompatibilities with Squeak's
Apache and MIT licenses.

Compatibility
=========
Ubuntu and Fedora prefer libjpeg-turbo, a fork which uses the same
liberal license and, I hope, the same API.

libjpeg-turbo really is on Sourceforge:

http://sourceforge.net/p/libjpeg-turbo/code/HEAD/tree/trunk/

I am not in any way a C or SLANG hacker, though I would like to learn.
Yet a quick browse of change.log in libjpegsr9a gives me some hope
that the API has not had many breaking changes since version 6a, which
I guess is the version that is in the Squeak platform sources.

While I have them handy, here are the version numbers as I found them
installed on my machines:
Debian 7.1  libjpeg8 8d-1 (binary is libjpeg.so.8.4.0)
Fedora 20  libjpeg-turbo 1.3.1 (binary is libjpeg.so.62.1.0)
Ubuntu 12.04 (old I know) libjpeg-turbo 1.1.90+svn733-0ubuntu4.3
(binary is libjpeg.so.8.4.0)

Guido's site links to this one, which hopefully will offer more
specific clues about what Squeak would need to change to work with the
newer platform libraries..

http://jpegclub.org/support/

Hope that helps.  Have fun!

David

[1]: http://squeakvm.org/cgi-bin/viewvc.cgi/squeak/trunk/platforms/Cross/plugins/JPEGReadWriter2Plugin/
as the other David mentioned

PS:
It looks like the libjpeg README didn't make it into the Squeak repo,
unless I looked in the wrong part of the tree. Would you like me to
post a request for this in Mantis?