diff --git a/Makefile b/Makefile
index 6d9a628..23977f2 100644
--- a/Makefile
+++ b/Makefile
@@ -3,11 +3,12 @@
 #### Start of system configuration section. ####
 
 CC = gcc
-INSTALL = /usr/bin/install
+INSTALL = /usr/bin/install -D
 INSTALL_PROGRAM = ${INSTALL}
 INSTALL_DATA = ${INSTALL} -m 644
 
-prefix = ""
+DESTDIR ?= ""
+prefix = ${DESTDIR}
 exec_prefix = ${prefix}
 
 # Where the installed binary goes.