How to install recent version on linux?

[James Blachly via D.gnu]

Apologies, but the website is extremely outdated, and I cannot find 
reliable, specific instructions on how to install  recent GDC on linux.

Distribution packages are often quite behind. For example, Ubuntu 16LTS 
which we are still on at work max out at GDC 5.

LDC is a tarball. Is there a similarly straightforward way to install 
GDC? If not, is this because we are constrained by system-available GCC 
version?

Thanks all for your help.