along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
-#if HAVE_CONFIG_H
+#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#if HAVE_STDINT_H
# include <stdint.h>
#endif
-#if HAVE_UNISTD_H
-# include <unistd.h>
-#endif
+#include <unistd.h>
#ifndef UINTMAX_MAX
# define UINTMAX_MAX ((uintmax_t) -1)
#endif