wstring and wchar_t usage with gcc

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hi,

My code using wstring and wchar_t does not compile. 
I realized that  "_GLIBCPP_USE_WCHAR_T" was undefined in c++config.h file 
and defined it.

 It cleared the first error ( i guess) but resulted in further errors like 
below  from the cwchar header.
 
/gcc/3.2.1/include/c++/3.2.1/cwchar:137: `btowc' not declared
/gcc/3.2.1/include/c++/3.2.1/cwchar:142: `fwide' not declared
/gcc/3.2.1/include/c++/3.2.1/cwchar:143: `fwprintf' not declared
/gcc/3.2.1/include/c++/3.2.1/cwchar:144: `fwscanf' not declared
/gcc/3.2.1/include/c++/3.2.1/cwchar:147: `mbrlen' not declared

Can someone tell me what needs to be done?

Thanks

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