--- Makefile.orig
+++ Makefile
@@ -51,9 +51,9 @@
 ERL_DIR := $(shell erl -noshell -eval "io:format([126,115,126,110],[code:root_dir()])" -s erlang halt)
 
 ifeq ($(INSTALL_DIR), )
-INSTALLDIR = $(ERL_DIR)/addons/$(ESDL_VSN)
+INSTALLDIR = $(DESTDIR)$(ERL_DIR)/addons/$(ESDL_VSN)
 else 
-INSTALLDIR = $(INSTALL_DIR)/$(ESDL_VSN)
+INSTALLDIR = $(DESTDIR)$(INSTALL_DIR)/$(ESDL_VSN)
 endif
 
 ## I assume that make install are only made on unixes... :-)