--- a/Makefile
+++ b/Makefile
@@ -11,8 +11,11 @@
 
 opt: xml-light.cmxa test_opt.exe
 
-install: all opt
-	cp xml-light.cmxa xml-light.a xml-light.cma xml.mli xmlParser.mli dtd.mli xml.cmi xmlParser.cmi dtd.cmi xml.cmx dtd.cmx xmlParser.cmx $(INSTALLDIR)
+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)
 
 doc:
 	mkdir doc