getline is missing on solaris gcc 3.3.2

[Jeff <jeff@xxxxxxxxxxx>]

I'm trying to compile on Solaris 8 using gcc 3.3.2. This simple test
does not compile, saying that it can't find getline. Where is getline on
Solaris? This works fine on Linux.

#define _GNU_SOURCE
#include <cstdio>

int main(int argc, char* const* argv)
{
   FILE* fp = fopen("test","r");
   size_t n;
   char* lineptr = new char[80];
   ssize_t n_read = getline(&lineptr, &n, fp);
}