Установка clang 3.8 на Ubuntu 14.04.3

Я пробовал следующие очевидные команды:

sudo apt-get update
sudo apt-get install clang-3.8

, но я получаю сообщение:

Reading package lists... Done
Building dependency tree       
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

, и я пробовал:

sudo apt-get update
sudo aptitude install clang-3.8

, но получите сообщение:

Couldn't find package "clang-3.8".  However, the following
packages contain "clang-3.8" in their name:
  clang-3.8-doc 
Couldn't find package "clang-3.8".  However, the following
packages contain "clang-3.8" in their name:
  clang-3.8-doc 
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.

Надеемся, что версия clang более поздняя, ​​чем 3.5. Любые предложения?