// not `compatibility' version with caddr_t.
#define _POSIX_C_SOURCE 199506L
-#include <sys/types.h>
-#include <sys/stat.h>
+#ifdef HAVE_SYS_TYPES_H
+# include <sys/types.h>
+#endif
+#ifdef HAVE_SYS_STAT_H
+# include <sys/stat.h>
+#endif
#include <fcntl.h>
#ifdef HAVE_UNISTD_H
-#include <unistd.h>
+# include <unistd.h>
#endif
#include <sys/mman.h>