How to convert accented characters to ASCII ?

[Borneq]

How convert Unicode diacritic character to plain?
For example ą->a ę->e ó->o
in both Linux and Windows systems.

[48bpfSEw]

mrs google works sundays too! ^^

http://stackoverflow.com/questions/14094621/change-all-accented-letters-to-normal-letters-in-c