install tesseract-ocr on a Mac

install_tesseract.sh

#!/usr/bin/env bash
# courtesy of : <https://ryanfb.github.io/etc/2014/11/13/command_line_ocr_on_mac_os_x.html>

# Check for Homebrew,
# Install if we don't have it
if test ! $(which brew); then
  echo "Installing homebrew..."
  ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
fi
# Ensure `homebrew` is up-to-date and ready
echo "Updating homebrew..."
brew doctor

# Ensure the Homebrew cache directory exists
mkdir ~/Library/Caches/Homebrew

# Install leptonica with TIFF support (and every other format, just in case)
echo "Installing leptonica..."
brew install --with-libtiff --with-openjpeg --with-giflib leptonica

# Install Ghostscript
echo "Installing ghostscript..."
brew install gs

# Install ImageMagick with TIFF and Ghostscript support
echo "Installing imagemagick..."
brew install --with-libtiff --with-ghostscript imagemagick

# Install Tesseract devel with all languages
echo "Installing tesseract..."
brew install --devel --all-languages tesseract

Error: invalid option: --all-languages