ntdll: Fix tape.c compilation on Darwin.
diff --git a/configure.ac b/configure.ac
index d802373..7765266 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1357,7 +1357,8 @@
 
 dnl Check for struct mtget members
 AC_CHECK_MEMBERS([struct mtget.mt_blksiz, struct mtget.mt_gstat, struct mtget.mt_blkno],,,
-[#ifdef HAVE_SYS_MTIO_H
+[#include <sys/types.h>
+#ifdef HAVE_SYS_MTIO_H
 #include <sys/mtio.h>
 #endif])