Comment 4 for bug 1863620

I do have /usr/include/jpeglib.h from media-libs/libjpeg-turbo.

I think I'm seeing the same hp-doctor problem mentioned in that forum post (that was on hplip 3.18.12). My printer is working fine so it is a problem with hp-doctor.

There are a few more posts out there with the same problem, these are from 2017:
https://forums.gentoo.org/viewtopic-t-1065638-highlight-hpdoctor.html
https://forums.gentoo.org/viewtopic-t-1071492-highlight-hpdoctor.html

this one from 2014 shows it working:
https://forums.gentoo.org/viewtopic-t-952040-highlight-hpdoctor.html

It worked for me in Feb 2019 so it doesn't seem to be tied to a particular version.

hp-check also has the same problem.