As long as it doesn't introduce any issues, and as long as it can coexist with normal libjpeg, why not compile a version for TDE just for the distros/versions that don't already have it?
We should not repackage anything still actively maintained upstream and is not a direct dependency for Trinity.
Serghei said he would add a detection test to the cmake files.
One note: if packagers build with libjpeg-turbo installed but downstream users do not have libjpeg-turbo installed, everything should still work. That is, using libjpeg-turbo should be optional in the code but still use the expected default libjpeg libraries when libjpeg-turbo is not installed.
Darrell