snap package for gnome-builder.
Enable the source in apt first, after that run "apt-get update", and "apt-get source gnome-builder" at the 3.20.4 directory.
The snapcraft could build it successfully.
Get the source code from git://git.gnome.org/gnome-builder , but it failed cause of the version of library is too low.
git@github.com:jhenstridge/gnome-builder.git
Now it can't work for 3.20.4, I could build it when disable some APIs.