def self.help
puts "Usage: passenger-config about <SUBCOMMAND>"
puts
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 " support-binaries-dir Show #{PROGRAM_NAME}'s support binaries dir."
puts " compiled Check whether runtime libraries are compiled."
puts " custom-packaged Check whether Phusion Passenger is custom"
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