size_t problem in include files

[Tahir Abdullah]

Hi folks
I am trying to compile my program on GCC 3.3.1 but in many header files like 
unistd.h, string.h and some other headers, i find the following errors:
error: type specifier omitted for parameter 'size_t'
error:'size_t' is used as a type, but is not defined as a type.

What is the problem. Thanks in advance
Thair
UNSW
Australia

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