On the step 2.1.2 "rosdep install --from-paths src --ignore-src --rosdistro indigo -y" the ROS-full installation fails with details below. Can anyone help?

executing command [brew install gazebo] Warning: osrf/simulation/gazebo1-1.9.7 already installed> ERROR: the following rosdeps failed to install homebrew: Failed to detect successful installation of [gazebo] System Details: Mid2010 Mac mini OSX 10.10.5