You need to build your own. The following will get the latest and will build the .deb packages:
git clone git://github.com/linuxcnc/linuxcnc.git linuxcnc-dev
cd linuxcnc-dev
cd debian
./configure uspace
cd ..
dpkg-checkbuilddeps
That last command will show all the missing packages that you will need to install. You install the packages with sudo apt install package-name.
You can do that with multiple packages in the package name location (make sure you get rid of the version that dpkg-checkbuilddeps shows).
You can keep running dpkg-checkbuilddeps until it output nothing which mean all dependencies are met. Once you are there, run the following command:
debuild -uc -us
It will do its thing for a while. Go get a coffee or whatever. Once it is done, it will have made multiple .deb files. Three languages of the manual, and the linuxcnc-uspace and linuxcnc-uspace-dev files. You can get rid of the rest. You can install them by double clicking the .deb file.
As you can see, it is fairly simple, but involved. After the first time you have installed the dependencies, it should be quicker. This is why it was mentioned in the first post he might start building the master on a daily or weekly timeline.
