diff --git a/Makefile b/Makefile
index 94aa386..cbd3538 100644
--- a/Makefile
+++ b/Makefile
@@ -84,6 +84,10 @@ SYNTAX_LIB=$(foreach s,$(SYNTAX),`ocamlfind query -predicates syntax,toploop,pre
 SYNTAX_INC=$(foreach s,$(SYNTAX),`ocamlfind query -i-format $(s)`)
 endif
 
+# enable threads
+ifneq ($(THREAD),)
+LINK_THREAD=-thread
+endif
 
 KEEP_COMPILER=\
 Arg Array ArrayLabels Buffer Callback CamlinternalLazy CamlinternalMod CamlinternalOO \
@@ -137,6 +141,16 @@ min:
 core:
 	make all EXT=".core" OPT=1 PACKAGES="core_kernel" PRIMJS="core_runtime.js" MODULES="Core_kernel"
 
+spoc:
+	make all \
+		OPT=1 \
+		THREAD=1 EXT=".spoc" \
+		CAMLP4=1 LWT=1 JSOO=1 \
+		SYNTAX="js_of_ocaml.syntax lwt.syntax.options lwt.syntax sarek_syntax spoc_external_kernels" \
+		PACKAGES="bigarray spoc_external_kernels spoc sarek sarek_syntax" \
+		MODULES="Spoc Kirc Bigarray" \
+		PRIMJS="$(shell ocamlfind query spoc)/spoc_lib.js"
+
 #######################################################################
 # build
 
@@ -164,7 +178,7 @@ iocaml_main.cmo: iocaml_main.ml iocaml.cmi
 	ocamlfind ocamlc -c iocaml_main.ml
 
 iocaml_full.byte: exec.cmo iocaml.cmo iocaml_main.cmo
-	ocamlfind ocamlc -linkall -linkpkg -o $@ \
+	ocamlfind ocamlc $(LINK_THREAD) -linkall -linkpkg -o $@ \
 		$(STD_PACKAGES) \
 		$(USER_PACKAGES) \
 		$(COMPILER_LIBS_INC) $(COMPILER_LIBS) \
diff --git a/iocaml.ml b/iocaml.ml
index e33dbee..7143854 100644
--- a/iocaml.ml
+++ b/iocaml.ml
@@ -209,7 +209,7 @@ let execute execution_count str =
     v##compilerStatus <- bool true;
     v
 
-let load_from_server path = 
+let load_from_server (_,path) = 
   try
     let xml = XmlHttpRequest.create () in
     let () = xml##_open(Js.string "GET", Js.string ("file/" ^ path), Js._false) in
diff --git a/iocaml.mli b/iocaml.mli
index 57f8b2d..21ecccd 100644
--- a/iocaml.mli
+++ b/iocaml.mli
@@ -19,7 +19,7 @@ val display : ?base64:bool -> string -> string -> unit
 val send_clear : ?wait:bool -> ?stdout:bool -> ?stderr:bool -> ?other:bool -> unit -> unit
 
 (* load a (binary) file from the server *)
-val load_from_server : string -> string option
+val load_from_server : (string*string) -> string option
 
 val output_cell_max_height : string ref