--- contrib/eqn2graph/Makefile.sub.orig	2014-02-07 14:15:24.000000000 +0900
+++ contrib/eqn2graph/Makefile.sub	2014-02-07 14:15:44.000000000 +0900
@@ -11,9 +11,9 @@
 	chmod +x $@
 
 install_data: eqn2graph
-	-test -d $(bindir) || $(mkinstalldirs) $(bindir)
-	-rm -f $(bindir)/eqn2graph
-	$(INSTALL_SCRIPT) eqn2graph $(bindir)/eqn2graph
+	-test -d $(DESTDIR)$(bindir) || $(mkinstalldirs) $(DESTDIR)$(bindir)
+	-rm -f $(DESTDIR)$(bindir)/eqn2graph
+	$(INSTALL_SCRIPT) eqn2graph $(DESTDIR)$(bindir)/eqn2graph
 
 uninstall_sub:
 	-rm -f $(bindir)/eqn2graph