Do use the actual ocaml stdlib (not the install dir) to find the
caml/*.h headers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42599 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/bindings/ocaml/Makefile.ocaml b/bindings/ocaml/Makefile.ocaml
index b157c31..278b31e 100644
--- a/bindings/ocaml/Makefile.ocaml
+++ b/bindings/ocaml/Makefile.ocaml
@@ -14,9 +14,8 @@
 
 include $(LEVEL)/Makefile.config
 
-# CFLAGS needs to be set before Makefile.rules is included. Yes, ocaml puts its
-# includes under its libdir.
-CFLAGS += -I$(OCAML_LIBDIR)
+# CFLAGS needs to be set before Makefile.rules is included.
+CFLAGS += -I$(shell $(OCAMLC) -where)
 
 include $(LEVEL)/Makefile.common