-BINDIR = $(DESTDIR)/usr/sbin
-MANDIR = $(DESTDIR)/usr/man
-INCDIR = $(DESTDIR)/usr/include
+PREFIX = @DESTDIR@
+DESTDIR = $(INSTROOT)$(PREFIX)
+BINDIR = $(DESTDIR)/sbin
+MANDIR = $(DESTDIR)/share/man/man8
+INCDIR = $(INSTROOT)@INCDIR@
+LIBDIR = $(INSTROOT)@LIBDIR@
+PKGCONFDIR = $(LIBDIR)/pkgconfig