C:\Users\xz\Desktop>ocra hello.rb
=== Loading script to check dependencies
hello world
C:/Ruby193/lib/ruby/gems/1.9.1/gems/ocra-1.3.0/bin/ocra:467: Use RbConfig instea
d of obsolete and deprecated Config.
=== Including 52 encoding support files (5179608 bytes, use --no-enc to exclude)

=== Building hello.exe
=== Adding user-supplied source files
=== Adding ruby executable ruby.exe
=== Adding library files
=== Compressing 14953751 bytes
=== Finished building hello.exe (3263227 bytes)