現象

[kamatari :~]$tmux                                                                                                                                        [master]
dyld: Library not loaded: /usr/local/lib/libevent-2.0.5.dylib
Referenced from: /usr/local/bin/tmux
Reason: image not found
[1]    2680 trace trap  tmux

直し方

libevent と tmux をuninstallして、tmuxを入れ直す

[kamatari :~]$ brew uninstall libevent                                                                                                                     [master]
Uninstalling /usr/local/Cellar/libevent/2.0.21...

[kamatari :~]$ brew uninstall tmux                                                                                                                         [master]
Uninstalling /usr/local/Cellar/tmux/1.9a...

[kamatari :~]$ brew install tmux                                                                                                                           [master]
==> Installing tmux dependency: libevent
==> Downloading https://downloads.sf.net/project/machomebrew/Bottles/libevent-2.0.21.mavericks.bottle.tar.gz
######################################################################## 100.0%
==> Pouring libevent-2.0.21.mavericks.bottle.tar.gz
🍺  /usr/local/Cellar/libevent/2.0.21: 48 files, 1.8M
==> Installing tmux
==> Downloading https://downloads.sf.net/project/machomebrew/Bottles/tmux-1.9a.mavericks.bottle.tar.gz
Already downloaded: /Library/Caches/Homebrew/tmux-1.9a.mavericks.bottle.tar.gz
==> Pouring tmux-1.9a.mavericks.bottle.tar.gz
==> Caveats
Example configurations have been installed to:
  /usr/local/Cellar/tmux/1.9a/share/tmux/examples

Bash completion has been installed to:
  /usr/local/etc/bash_completion.d
==> Summary
🍺  /usr/local/Cellar/tmux/1.9a: 16 files, 632K