+dnl Build the OCaml viewer example. This has a lengthy list of
+dnl dependencies and we don't attempt to detect them all. Read
+dnl the top of ocaml/examples/viewer.ml before enabling this.
+AC_ARG_ENABLE([ocaml-viewer],
+ [AS_HELP_STRING([--enable-ocaml-viewer],
+ [enable OCaml viewer (see ocaml/examples) @<:@default=no@:>@])],
+ [],
+ [enable_ocaml_viewer=no])
+AM_CONDITIONAL([BUILD_OCAML_VIEWER],[test "x$enable_ocaml_viewer" = "xyes"])
+