Author: me
Descripotion: Add DESTDIR support in Makefile
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@
 	gcc -Wall -o hello hello.c
 
 install: hello
-	install -D hello /usr/local/bin/hello
+	install -D hello $(DESTDIR)/usr/bin/hello
 
 clean:
 	-rm -f hello
