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STDERR_FILENO undeclared on ubuntu

#1
I'm trying to compile [an example stack trace displaying code][1]. When I compile the `test.c` file with:

gcc -g -rdynamic ./test.c -o test

I get following error:

./test.c: In function ‘handler’:
./test.c:16: error: ‘STDERR_FILENO’ undeclared (first use in this function)
./test.c:16: error: (Each undeclared identifier is reported only once
./test.c:16: error: for each function it appears in.)

My includes are the same as in the original post code:

#include <stdio.h>
#include <execinfo.h>
#include <signal.h>
#include <stdlib.h>

My machine is ubuntu 13.04. Am I missing some library or haven't included something?

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#2
Also `#include <unistd.h>`.

See this [GNU documentation][1].


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