Re-add the ocamlbuild plugin lost in the reorganization.

packages/myocamlbuild.ml

@@ -0,0 +1,29 @@
+open Ocamlbuild_plugin;;
+open Command;;
+
+module Util = struct
+  let split s ch =
+    let x = ref [] in
+    let rec go s =
+      let pos = String.index s ch in
+      x := (String.before s pos)::!x;
+      go (String.after s (pos + 1))
+    in
+    try
+      go s
+    with Not_found -> !x
+
+    let split_nl s = split s '\n'
+    let run_and_read x = List.hd (split_nl (Ocamlbuild_pack.My_unix.run_and_read x))
+end
+
+let query dir = Util.run_and_read ("ocamlfind query " ^ dir);;
+
+dispatch begin function
+| After_rules ->
+    flag ["camlp4of"; "build_syntax"]
+	(S[A "-I"; A "+camlp4"]);
+    flag ["compile"; "use_custom_stdlib"]
+	(S[A "-nostdlib"; A "-I"; A (query "mirage-stdlib")]);
+| _ -> ()
+end;;