How do you update tmux from 1.7 to 1.8?

How do you update tmux from 1.7 to 1.8?

I just recently installed tmux 1.7, but now i want to upgrade to 1.8. How do I go about doing this? I downloaded the sources for 1.8 and have them untarred. But im not sure how do you overwrite 1.7 installaion.