diff --git a/Makefile b/Makefile
index 4dd0b880..684f28ac 100644
--- a/Makefile
+++ b/Makefile
@@ -1,19 +1,19 @@
 
 PREFIX=/usr
-CFLAGS=-O2 -Wall -g
+CFLAGS+=-O2 -Wall -g
 
 all: make-bcache probe-bcache
 
 install: make-bcache probe-bcache
-	install -m0755 make-bcache ${PREFIX}/sbin/
-	install -m0755 probe-bcache /sbin/
-	install -m0644 61-bcache.rules /lib/udev/rules.d/
-	install -m0755 initramfs /usr/share/initramfs-tools/hooks/bcache
-	install -m0644 make-bcache.8 ${PREFIX}/share/man/man8
-#	install -m0755 bcache-test ${PREFIX}/sbin/
+	install -m0755 make-bcache $(DESTDIR)${PREFIX}/sbin/
+	install -m0755 probe-bcache $(DESTDIR)/sbin/
+	install -m0644 61-bcache.rules $(DESTDIR)/lib/udev/rules.d/
+	install -m0755 initramfs $(DESTDIR)/usr/share/initramfs-tools/hooks/bcache
+	install -m0644 make-bcache.8 $(DESTDIR)${PREFIX}/share/man/man8
+#	install -m0755 bcache-test $(DESTDIR)${PREFIX}/sbin/
 
 clean:
-	rm -f make-bcache probe-bcache bcache-test *.o
+	$(RM) -f make-bcache probe-bcache bcache-test *.o
 
 bcache-test: LDLIBS += -lm -lssl -lcrypto
 make-bcache: LDLIBS += -luuid