Use Erlang make module to compile.

Makefile

@@ -2,25 +2,26 @@ PROJECT=getopt
 ERL=erl
 ERLC=erlc -I include -v -o ebin
 SOURCES=src/*.erl
-TEST_SOURCES=src/test/*.erl
 EPATH=-pa ebin
+DOC_OPTS={dir, \"doc\"}, {source_path, [\"include\", \"src\"]}
 
 all:
 	@mkdir -p ebin
-	$(ERLC) $(SOURCES)
-			 
-all_test: all
-	@mkdir -p ebin
-	$(ERLC) -DTEST $(TEST_SOURCES)
-		 
+	$(ERL) $(EPATH) -make
+
 run:
 	$(ERL) -sname "$(PROJECT)" $(EPATH)
-		 
-test: all_test
+
+test: all
+	$(ERL) -noshell $(EPATH) -s $(PROJECT)_test test -s init stop
+
+edoc: all
 	$(ERL) -noshell $(EPATH) \
-		-s $(PROJECT)_test test \
+		-eval "edoc:files([string:tokens(\"src/getopt.erl\", \" \")], [$(DOC_OPTS)])" \
 		-s init stop
-		 
+
+
 clean:
 	rm -fv ebin/*.beam
+	rm -fv doc/*
 	rm -fv erl_crash.dump ebin/erl_crash.dump