Sources from: (old) http://www.ijg.org/files/ (current) https://sourceforge.net/projects/libjpeg/files/libjpeg/ Depends on:
The latest release is version 6b of 27-Mar-1998. This is a stable and solid foundation for many application's JPEG support.
And also says:
Libjpeg maintenance was migrated to SourceForge in 2006, and maintenance releases are planned for early 2009.
While the so-called "old" archive has files and versions higher than 6b (what I am calling version 6.2)
Here is libjpeg as used by the packages found on aixtools that need it.