"libevent not found" error in tmux

For anyone who encounters this on mac you can install it via homebrew: http://macappstore.org/libevent/ => brew install libevent

If you're trying to build software then you need the development package. Install libevent-devel.

On Debian/Ubuntu based distributions you can install it with

sudo apt install libevent-dev

For CentOS,

sudo yum install libevent-devel