Running gitk from the command line, while at the top level of a Git working directory, produces the following error message, and gitk fails to open: > objc[1031]: Objective-C garbage collection is no longer supported. > /usr/local/bin/wish: line 2: 1031 Abort trap: 6 "$(dirname $0)/../../../Library/Frameworks/Tk.framework/Versions/8.5/Resources/Wish.app/Contents/MacOS/Wish" "$@" Additionally, the following error message pops up in a window: > Wish quit unexpectedly. > Click Reopen to open the application again. Click Report to see more detailed information and send a report to Apple. > Ignore | Report... | Reopen How can this be fixed? *** OS: macOS Sierra, Version 10.12.4 Git version: 2.11.0 (Apple Git-81)