Installation Steps:

Open Terminal using Spotlight search by pressing  <command+space>.
Type terminal and hit  Enter key.

• Now, run
  ruby -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)” < /dev/null 2> /dev/null
• Install ceres-solver using brew
  brew install _ceres-solver

ceres-solver is ready to use now!