Add a rule to create a tarball

Makefile

@@ -9,9 +9,11 @@ MKDIR_P	?= mkdir -p
 INSTALL	?= install
 RM	?= rm -f
 SED	?= sed
+TAR	?= tar
 
 PROG = nautilus-mp3-converter
 ACTION = $(PROG).desktop
+DIST = $(PROG) $(ACTION) Makefile
 
 all: $(PROG) $(ACTION)
 
@@ -25,3 +27,9 @@ install: all
 uninstall:
 	$(RM) $(bindir)/$(PROG)
 	$(RM) $(actionsdir)/$(ACTION)
+
+# FIXME: proper permissions no matter the local ones
+$(PROG).tar.gz: $(DIST)
+	$(TAR) -z -c --transform 's%^%$(PROG)/%' -f "$@" $^
+
+dist: $(PROG).tar.gz