--- autogen-5.18.16.old/autoopts/file.c
+++ autogen-5.18.16/autoopts/file.c
@@ -1,4 +1,3 @@
-
 /**
  * \file file.c
  *
@@ -37,6 +36,9 @@
  * @param pOpts program option descriptor
  * @param pOD   the option descriptor
  */
+
+#include <fcntl.h>
+
 static void
 check_existence(teOptFileType ftype, tOptions * pOpts, tOptDesc * pOD)
 {