Required files
rubygems/defaults
thread
etc
rbconfig
zlib
fileutils
stringio
zlib
stringio
zlib
zlib
sources
rubygems/user_interaction
rubygems/exceptions
rubygems/version
rubygems/requirement
rubygems/dependency
rubygems/gem_path_searcher
rubygems/source_index
rubygems/platform
rubygems/builder
rubygems/defaults/operating_system
rubygems/config_file
rubygems/custom_require