osx_clipboard.el

osx_clipboard.el

(setq interprogram-cut-function
      (lambda (text &optional push)
        (let* ((process-connection-type nil)
               (pbproxy (start-process "pbcopy" "pbcopy" "/usr/bin/pbcopy")))
          (process-send-string pbproxy text)
          (process-send-eof pbproxy))))

(setq interprogram-paste-function
      (lambda ()
        (shell-command-to-string "pbpaste")))

This is awesome, thank you!

I found the following additional bits necessary...

At shell prompt...

brew install reattach-to-user-namespace --wrap-pbcopy-and-pbpaste

Added to ~/.tmux.conf...

set-option -g default-command "reattach-to-user-namespace -l bash"