# File lib/rake.rb, line 2400
2400:     def system_dir
2401:       @system_dir ||=
2402:         begin
2403:           if ENV['RAKE_SYSTEM']
2404:             ENV['RAKE_SYSTEM']
2405:           else
2406:             standard_system_dir
2407:           end
2408:         end
2409:     end