Frank Peters <frank.peters@comcast.net> skribis:
> Here is the Gentoo changelog for 1.3.0-r2:
> 
> "Revert back to .so.62 with 2 functions backported from .so.8, namely
> jpeg_mem_dest() and jpeg_mem_src(). ABIs .so.7 and .so.8 are dead and
> shouldn't be used anywhere anymore."
> 
> This sudden change required the re-emerge of a LOT of packages.
> 
> I have not been able to find any background information on the
> reason for this change.  Does anyone know the story behind this
> elimination of the newer JPEG ABI's and the step back to .so.62?
> Has any functionality, such as lossless cropping, been affected?

This seems to be the story, if you make some inferences:

http://www.libjpeg-turbo.org/About/Jpeg-9
 
Basically, it says 7, 8, and now 9 were all a mistake.