--- a/Makefile
+++ b/Makefile
@@ -9,13 +9,13 @@
 
 all: xml-light.cma test.exe doc
 
-opt: xml-light.cmxa test_opt.exe
+opt: xml-light.cmxs test_opt.exe
 
 install: all 
 	cp xml-light.cma xml.mli xmlParser.mli dtd.mli xml.cmi xmlParser.cmi dtd.cmi  $(INSTALLDIR)
 
 installopt: opt all 
-	cp xml-light.a xml-light.cmxa xml.cmx dtd.cmx xmlParser.cmx $(INSTALLDIR)
+	cp xml-light.a xml-light.cmxa xml-light.cmxs xml.cmx dtd.cmx xmlParser.cmx $(INSTALLDIR)
 
 doc:
 	mkdir doc
@@ -33,6 +33,9 @@
 xml-light.cmxa: xml_parser.cmx xml_lexer.cmx dtd.cmx xmlParser.cmx xml.cmx 
 	ocamlopt -o xml-light.cmxa $(XML_LIGHT_OCAML_LFLAGS) $(LIBS) xml_parser.cmx xml_lexer.cmx dtd.cmx xmlParser.cmx xml.cmx
 
+xml-light.cmxs: xml-light.cmxa
+	ocamlopt -o xml-light.cmxs -shared -linkall xml-light.cmxa
+
 dtd.cmo: xml.cmi xml_lexer.cmi dtd.cmi
 
 dtd.cmx: xml.cmi xml_lexer.cmi dtd.cmi