sigset_t and gcc

From: Jade Fox (cjchen_at_eden.rutgers.edu)
Date: 11/26/03 

Date: 26 Nov 2003 06:58:21 -0800

Can anybody tell me what is wrong with the following code?
It compiles ok with 'gcc file.c',
but not 'gcc -ansi file.c' or 'gcc -std=c99 file.c'.
It complains that 'sigset_t' is undeclared.
What options am I missing? Thanks

#include <signal.h>

int main()
{
    sigset_t set;
}

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