LinuxCNC on Debian Stretch

Maybe this is a little too bleeding edge, but I tried installing LinuxCNC on Debian Stretch. Surprisingly, I found a recent RT-preempt kernel in the Stretch repository that I didn't have to compile.

I tried installing LinuxCNC

and got unmet dependencies

I installed libboost but it's version 1.62. That doesn't work. So I temporarily used the Jessie repository (yeah, I know, not a good thing), and got LinuxCNC installed with libboost 1.55. It runs, but very slowly.

Any advice?

I am not sure which repository does the trick but I added wheezy and jessy backports to my /etc/apt/sources.list.
I am using linux-image-4.9.0-3-rt-686-pae with lxde, synaptic sees and installs lcnc with no issues.
Edit:
Net install stretch today.

So you were running Debian Stretch, and you installed LinuxCNC using wheezy and jessie-backports repositories? That does not make sense to me. Maybe I misunderstood, and you're running Debian Wheezy or Jessie, but with a 4.9.0 rt kernel. That makes sense. I have another system running Jessie 8.6 with a 4.6.0 rt kernel, and that works fine, and LinuxCNC installs without difficulty.

It's Debian Stretch that's breaking dependencies, not the rt kernel.

Nope stretch is fine just add extra repositories fin order to pick up the dependencies that synaptic looks for and needs to install lcnc it is simple and quick.
I was using stretch with lxde and 4.9.0.2 until yesterday when I downloaded the testing net install from here cdimage.debian.org/cdimage/daily-builds/...latest/amd64/iso-cd/
Then added lxde-core, lxrandr, lxtask, reboot to gui and install whatever I want via synaptic after adding the backports.
Why complicate what is already simple?

I searched the Debian repositories, and the only place that has libboost-python1.55.0 is Jessie

I'm running an i386 version of Stretch and XFCE, so maybe that's why my experience is different than yours.

Using the Jessie repository as described in my first post again, I got LinuxCNC installed again. And again, it runs slow as molasses, and I get Servo times over 100,000 us. Popping up the Latency Test screen takes over a minute and the mouse moves with about a 15 second delay..

Maybe this computer is too slow. Maybe it does not like python1.55.0. Maybe it would run better on an X64 version. Maybe I need to set some switches in Grub or in my BIOS. Maybe the 4.6.0 rt kernel would work better. Ah, so much to try. It's never easy.

This kernel available in jessie backport repository