#include <cassert>
#include <sys/types.h>
#include <cstdio>
#include <cassert>
#include <sys/types.h>
#include <cstdio>
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
#include <fcntl.h>
#include <cerrno>
#include <cstdlib>
#include <fcntl.h>
#include <cerrno>
#include <cstdlib>