There are so many targets... add "make help"

Makefile.in

@@ -426,3 +426,29 @@ test:
 .PHONY: src edoc dialyzer Makefile TAGS clean clean-rel distclean rel \
 	install uninstall uninstall-binary uninstall-all translations deps test \
 	quicktest erlang_plt deps_plt ejabberd_plt xref hooks options
+
+help:
+	@echo ""
+	@echo "  [all]          Compile dependencies and ejabberd"
+	@echo "  src            Compile ejabberd"
+	@echo "  deps           Get dependencies"
+	@echo "  update         Update dependencies' source code"
+	@echo "  clean          Clean binary files"
+	@echo "  distclean      Clean completely the development files"
+	@echo ""
+	@echo "  install        Install ejabberd to /usr/local"
+	@echo "  uninstall      Uninstall ejabberd (buggy)"
+	@echo "  uninstall-all  Uninstall also configuration, logs, mnesia... (buggy)"
+	@echo ""
+	@echo "  rel            Build a production release"
+	@echo "  dev            Build a development release"
+	@echo ""
+	@echo "  edoc           Generate edoc documentation (unused)"
+	@echo "  options        Generate ejabberd_option.erl"
+	@echo "  translations   Extract translation files (requires --enable-tools)"
+	@echo "  tags           Generate tags file for text editors"
+	@echo ""
+	@echo "  dialyzer       Run Dialyzer static analyzer"
+	@echo "  hooks          Run hooks validator"
+	@echo "  test           Run Common Tests suite"
+	@echo "  xref           Run cross reference analysis"