"uninitialized constant Encoding::UTF_8" in rb_require

When load script with rb_require I got error about Encoding constants.
Ruby 1.9.2

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Encoding.list return [#<Encoding:ASCII-8BIT>, #<Encoding:UTF-8>,
#<Encoding:US-ASCII>] in program and return more encoding in irb.
As I understood, I have to load required encodings, but cann't find any
documentation about it.

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Fixed.
I added next string into ruby initialization code as ruby interpreter
do:

rb_enc_find_index("encdb");

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