Revision r154807 <http://trac.webkit.org/r154807> switched the install dependency on Debian and derivatives from libjpeg-turbo to the IJG implementation of libjpeg.
Debian is switching is default libjpeg library to libjpeg-turbo <https://wiki.debian.org/LJTTransition#Text>
Also, install-dependencies installs libjpeg-turbo for other distributions (Fedora/Arch).
The EFL port also installs libjpeg-turbo.
$ grep jpeg Tools/gtk/install-dependencies Tools/efl/install-dependencies
Tools/gtk/install-dependencies: libjpeg8-dev \
Tools/gtk/install-dependencies: libjpeg-turbo \
Tools/gtk/install-dependencies: libjpeg-turbo-devel \
Tools/efl/install-dependencies: libjpeg-dev \
Created attachment 239471 [details]
Comment on attachment 239471 [details]
Clearing flags on attachment: 239471
Committed r174453: <http://trac.webkit.org/changeset/174453>
All reviewed patches have been landed. Closing bug.