The output from HOMEBREW_MAKE_JOBS=1 VERBOSE=1 brew install opencv 2>&1: Here's the Gist. The contents of the largest numbered log in ~/Library/Logs/Homebrew/foo, for example: 03.make;: There are no logs: kba:~/ $ ls -la ~/Library/Logs/Homebrew/opencv total 0 drwxr-xr-x 2 kba staff 68 17 Jun 18:28 . drwxr-xr-x 45 kba staff 1530 17 Jun 18:21 .. The output from brew doctor;: kba:~/ $ brew doctor You