diff --git a/Makefile b/Makefile
index e3eb62d..1ae678d 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,8 @@ CARGO_HOME?=/opt/rust/cargo
 RUST_TARGET?=x86_64-unknown-linux-gnu
 
 DESTDIR?=$(ROOT_DIR)/build/
-BUILD_PREFIX:=$(DESTDIR)/opt/www
+BUILD_PREFIX:=/opt/www
+INSTALL_DIR:=$(DESTDIR)/$(BUILD_PREFIX)
 
 VERSION?=2.0.0
 BRANCH?=b
@@ -22,8 +23,8 @@ all: antos tar.gz
 antos: antd backend frontend
 
 antd: httpd plugins luasec luasocket silk luafcgi
-	rm $(BUILD_PREFIX)/runner.ini
-	cp $(ROOT_DIR)/config/*.ini $(BUILD_PREFIX)/etc
+	rm $(INSTALL_DIR)/runner.ini
+	cp $(ROOT_DIR)/config/*.ini $(INSTALL_DIR)/etc
 	@echo "Finish building Antd server"
 
 httpd:
@@ -67,20 +68,20 @@ luasocket:
 antd-% sil%: httpd
 	@echo "Building $@"
 	cd $(ROOT_DIR)/antd/$@ && libtoolize && aclocal && autoconf && automake --add-missing
-	cd $(ROOT_DIR)/antd/$@  && CFLAGS="-I$(BUILD_PREFIX)/include" LDFLAGS="-L$(BUILD_PREFIX)/lib" ./configure --prefix=$(BUILD_PREFIX)
+	cd $(ROOT_DIR)/antd/$@  && CFLAGS="-I$(INSTALL_DIR)/include" LDFLAGS="-L$(INSTALL_DIR)/lib" ./configure --prefix=$(BUILD_PREFIX)
 	make -C $(ROOT_DIR)/antd/$@ install
 
 luafcgi:
 ifeq ($(LUAFCGI_IGNORE),)
 	@echo "Building $@"
-	mkdir -p $(BUILD_PREFIX)/bin
+	mkdir -p $(INSTALL_DIR)/bin
 	RUSTUP_HOME=$(RUSTUP_HOME) CARGO_HOME=$(CARGO_HOME) \
 	. $(CARGO_HOME)/env && \
 		rustup target add $(RUST_TARGET) && \
 		cargo build --target=$(RUST_TARGET) --release \
 		--manifest-path=$(ROOT_DIR)/antd/luafcgi/Cargo.toml \
 		--config=$(ROOT_DIR)/antd/luafcgi/.cargo/config.toml
-	install -m 0755 $(ROOT_DIR)/antd/luafcgi/target/$(RUST_TARGET)/release/luad $(BUILD_PREFIX)/bin
+	install -m 0755 $(ROOT_DIR)/antd/luafcgi/target/$(RUST_TARGET)/release/luad $(INSTALL_DIR)/bin
 else
 	@echo "Ignore building $@"
 endif
@@ -101,14 +102,14 @@ clean:
 
 backend:
 	@echo "Building $@"
-	mkdir -p $(BUILD_PREFIX)/htdocs/os
-	DESTDIR=$(BUILD_PREFIX)/htdocs/os make -C antos-backend
+	mkdir -p $(INSTALL_DIR)/htdocs/os
+	DESTDIR=$(INSTALL_DIR)/htdocs/os make -C antos-backend
 
 frontend:
 ifeq ($(FRONTEND_IGNORE),)
 	@echo "Building $@"
-	mkdir -p $(BUILD_PREFIX)/htdocs/os
-	BUILDDIR=$(BUILD_PREFIX)/htdocs/os make -C antos-frontend install_dev release
+	mkdir -p $(INSTALL_DIR)/htdocs/os
+	BUILDDIR=$(INSTALL_DIR)/htdocs/os make -C antos-frontend install_dev release
 else
 	@echo "Ignore building $@"
 endif