Check http_referer in Makefile

Makefile

@@ -13,18 +13,25 @@ all: $(BIN)
 
 $(BIN): $(OBJ)
 
-install: $(BIN) domainrc
+install: $(BIN) domainrc dillorc
 	mkdir -p $(DPI_DIR)/$(NAME)
 	cp -f $(BIN) $(DPI_DIR)/$(NAME)
 
-link: $(BIN) domainrc
+link: $(BIN) domainrc dillorc
 	mkdir -p $(DPI_DIR)/$(NAME)
 	ln -frs $(BIN) $(DPI_DIR)/$(NAME)
 
+dillorc: $(DILLO_DIR)/dillorc
+	@grep -q '^http_referer=\(host\|path\)$$' $< || \
+		echo 'Note: Set "http_referer=path" in $< to allow form submissions to work'
+
 domainrc: $(DILLO_DIR)/domainrc
 	@grep -q '^default accept$$' $< || \
 		echo 'Note: Set "default accept" in $< to enable redirects'
 
+$(DILLO_DIR)/dillorc:
+	echo 'http_referer=path' > $@
+
 $(DILLO_DIR)/domainrc:
 	echo 'default accept' > $@