--- Makefile_start.orig	2020-03-23 18:53:54 UTC
+++ Makefile_start
@@ -80,7 +80,7 @@ install: all FORCE
 	$(MAKE) -C bin \
                 EXEEXT=$(EXEEXT) \
                 PROGSIN="$(PROGRAMS)" \
-                INSTALLDIR=$(INSTALLDIR) \
+                INSTALLDIR=$(DESTDIR)$(INSTALLDIR) \
                 install
 	sed 's/VERSION/${VERSION}/g' packageconfig_start > lib/bibutils.pc