--- data/Makefile.orig	2018-07-28 08:20:48 UTC
+++ data/Makefile
@@ -1,6 +1,6 @@
 PACKAGENAME=rockdodger
 
-prefix = $(DESTDIR)/usr/local
+prefix = ${PREFIX}
 datarootdir = $(prefix)/share
 datadir = $(datarootdir)
 bindir = $(exec_prefix)/bin
@@ -19,9 +19,9 @@ all:
 	@echo PACKAGENAME = $(PACKAGENAME)
 
 install:
-	$(INSTALL) -d $(datadir)/$(PACKAGENAME)/images
-	cp $(DATAFILES) $(datadir)/$(PACKAGENAME)
-	cp $(IMAGES) $(datadir)/$(PACKAGENAME)/images
+	$(INSTALL) -d ${DESTDIR}$(datadir)/$(PACKAGENAME)/images
+	cp $(DATAFILES) ${DESTDIR}$(datadir)/$(PACKAGENAME)
+	cp $(IMAGES) ${DESTDIR}$(datadir)/$(PACKAGENAME)/images
 
 uninstall:
 	rm -rf $(datadir)/$(PACKAGENAME)/