Setup steps and Problems encountered:
First, set diff as external tool in Sourcetree.
1. Step: Open the diff menu for Sourcetree preferences.
2. Problem: found that the "External code diff/merge" menu in Sourcetree preferences is not available.
3, Plan: Modify the settings, allow Sourcetree settings affect the global re-enter external diff to set up.
Second, enable external tools beyond compare
1, Step: Continue to select "Beyond Compare" in the visual contrast tool.
2, problem: Last archive time prompt "command line utility Bcomp not found on your system. Make sure that the command-line tool that you installed selects options for you. ”
3. Program: Open Beyond Compare, click "Install Command line tool" in the property menu, and Sourcetree will be able to save when it is closed.
Mac Sourcetree Enable external Merge tool (beyond Compare)