--- core-109.37.00.orig/lib/core_unix.ml	2013-08-06 21:52:16.000000000 +0200
+++ core-109.37.00/lib/core_unix.ml	2013-08-13 15:25:11.000000000 +0200
@@ -890,6 +890,7 @@
 | O_SYNC
 | O_RSYNC
 | O_SHARE_DELETE
+| O_CLOEXEC
 with sexp
 
 type file_perm = int with of_sexp
--- core-109.37.00.orig/lib/core_unix.mli	2013-08-06 21:52:16.000000000 +0200
+++ core-109.37.00/lib/core_unix.mli	2013-08-13 15:25:32.000000000 +0200
@@ -305,6 +305,7 @@
     | O_SYNC          (** Writes complete as `Synchronised I/O file integrity completion' *)
     | O_RSYNC         (** Reads complete as writes (depending on O_SYNC/O_DSYNC) *)
     | O_SHARE_DELETE  (** Windows only: allow the file to be deleted while still open *)
+    | O_CLOEXEC
 with sexp
 
 (** The type of file access rights. *)