LLVM version 3.4.2 - Directory to Environment Variables


Currently I am trying to install LLVM version 3.4.2. I am using Linux Mint 18.3 Sylvia.

I followed steps to install it from this following website :

I was able to configure and build LLVM and Clang.
I set the environment variables in /etc/environment to :


After I set up the environment variables for the LLVM, I am still unable to run LLVM and Clang.

jake@jake-Inspiron-5448 ~ $ llvm
No command ‘llvm’ found, did you mean:
Command ‘rlvm’ from package ‘rlvm’ (universe)
Command ‘lvm’ from package ‘lvm2’ (main)
Command ‘lkvm’ from package ‘kvmtool’ (universe)
llvm: command not found
jake@jake-Inspiron-5448 ~ $ clang
The program ‘clang’ is currently not installed. You can install it by typing:
sudo apt install clang

May I know, is the directory to environment variables is correct? If not correct, may I know the correct directory?

Many thanks for your help.