Index: parmap.ml
--- parmap.ml.orig
+++ parmap.ml
@@ -109,7 +109,8 @@ let redirect ?(path = (Printf.sprintf "/tmp/.parmap.%d
 (* unmarshal from a mmap seen as a bigarray *)
 let unmarshal fd =
  let a =
-   Bigarray.Array1.map_file fd Bigarray.char Bigarray.c_layout true (-1) in
+   Bigarray.array1_of_genarray @@
+   Unix.map_file fd Bigarray.char Bigarray.c_layout true [|~-1|] in
  let res = Bytearray.unmarshal a 0 in
  Unix.close fd;
  res
@@ -124,8 +125,9 @@ let unmarshal fd =
     - on Linux kernels, we might allocate a mmapped memory area of huge_size
       and marshal into it directly
 
-      let ba = Bigarray.Array1.map_file
-                 fd Bigarray.char Bigarray.c_layout true huge_size in
+      let ba =
+        Bigarray.array1_of_genarray @@
+        Unix.map_file fd Bigarray.char Bigarray.c_layout true huge_size in
       ignore(Bytearray.marshal_to_buffer ba 0 v [Marshal.Closures]);
       Unix.close fd
 
@@ -624,7 +626,8 @@ let init_shared_buffer a =
   let size = Array.length a in
   let fd = Utils.tempfd() in
   let arr =
-    Bigarray.Array1.map_file fd Bigarray.float64 Bigarray.c_layout true size in
+    Bigarray.array1_of_genarray @@
+    Unix.map_file fd Bigarray.float64 Bigarray.c_layout true [|size|] in
 
   (* The mmap() function shall add an extra reference to the file associated
      with the file descriptor fildes which is not removed by a subsequent