Contributed by Fred Fish at Cygnus Support. fnf@cygnus.com */
-#ifdef HAVE_UNISTD_H
+#include "src/internal_config.h"
+#if HAVE_UNISTD_H
#include <unistd.h> /* Prototypes for lseek */
#endif
#include <stdio.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/wait.h>
+#include <errno.h>
#include "mmprivate.h"
