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Support for the ks_c_5601-1987 encoding has been requested, but is not yet supported by libiconv.
Target 0.7.0 for review in that timeframe.
a quick search's result seems to mean it is now supported by libiconv http://www.sra.co.jp/people/akira/os2/libiconv/encodings_1_3.html
Added in CVS.