Keyword _Imaginary in C99 standard and in GCC

[Yao qi]

Hi, everyone,
I have looked through C99 standard, in 6.4.1 Keywords,  "_Imaginary" is 
mentioned as a keyword in this standard.  However, it seems that GCC can not 
recognize it,  report error: '_Imaginary' undeclared.  I also search it in 
GCC info, there is no spot mentioned that.  Maybe GCC does not include it as 
a keyword, I am not sure about that, am I missing something?  Maybe someone 
of you could clarify for me.  Thanks in advance.

Best Regards
----------------
Yao Qi
Bejing Institute of Technology

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