# File lib/phusion_passenger/config/about_command.rb, line 31
        def self.help
                puts "Usage: passenger-config about <SUBCOMMAND>"
                puts "Show information about #{PROGRAM_NAME}."
                puts
                puts "Available subcommands:"
                puts "  root                     Show #{PROGRAM_NAME}'s root."
                puts "  ruby-libdir              Show #{PROGRAM_NAME}'s Ruby library directory."
                puts "  includedir               Show the Nginx runtime library headers directory."
                puts "  nginx-addon-dir          Show #{PROGRAM_NAME}'s Nginx addon directory."
                puts "  nginx-libs               Show Nginx runtime library flags."
                puts "  resourcesdir             Show #{PROGRAM_NAME}'s resources directory."
                puts "  compiled                 Check whether runtime libraries are compiled."
                puts "  natively-packaged        Check whether Phusion Passenger is natively"
                puts "                           packaged."
                puts "  installed-from-release-package  Check whether this installation came from"
                puts "                                  an official release package."
                puts "  make-locations-ini       Generate a locations.ini based on the current"
                puts "                           install paths."
                puts "  detect-apache2           Autodetect Apache installations."
                puts "  ruby-command             Show the correct command for invoking the Ruby"
                puts "                           interpreter."
                puts "  rubyext-compat-id        Show the Ruby extension binary compatibility ID."
                puts "  cxx-compat-id            Show the C++ binary compatibility ID."
                puts "  version                  Show the version number."
        end