It's now important, since it defines _GNU_SOURCE.
#ifndef CCAN_FAILTEST_H
#define CCAN_FAILTEST_H
#ifndef CCAN_FAILTEST_H
#define CCAN_FAILTEST_H
#include <sys/types.h>
#include <stdbool.h>
#include <fcntl.h>
#include <sys/types.h>
#include <stdbool.h>
#include <fcntl.h>
#ifndef CCAN_FAILTEST_OVERRIDE_H
#define CCAN_FAILTEST_OVERRIDE_H
/* This file is included before the source file to test. */
#ifndef CCAN_FAILTEST_OVERRIDE_H
#define CCAN_FAILTEST_OVERRIDE_H
/* This file is included before the source file to test. */
/* Replacement of allocators. */
#include <stdlib.h>
/* Replacement of allocators. */
#include <stdlib.h>