diff --git a/Makefile b/Makefile
index e26f446..dc0b9d5 100644
--- a/Makefile
+++ b/Makefile
@@ -7,10 +7,10 @@ target ?= sh-elf
 lib    := libprof.a
 header := libprof.h
 
-prefix := $(shell $(target)-gcc -print-search-dirs | grep install \
+PREFIX ?= $(shell $(target)-gcc -print-search-dirs | grep install \
                   | sed 's/install: //')
 
-ifeq "$(prefix)" ""
+ifeq "$(PREFIX)" ""
 $(error "Cannot determine compiler install path")
 endif
 
@@ -42,5 +42,5 @@ distclean: clean
 # Install
 
 install:
-	cp $(lib) $(prefix)
-	cp $(header) $(prefix)/include
+	cp $(lib) $(DESTDIR)$(PREFIX)
+	cp $(header) $(DESTDIR)$(PREFIX)/include