--- Makefile.orig	Wed Feb  1 23:21:42 2017
+++ Makefile	Wed Feb  1 23:21:47 2017
@@ -92,16 +92,12 @@ BINMODE = 755
 
 VERSION = 2.3.10
 
-INSTALLROOT ?= $(DESTDIR)$(PREFIX)
+INSTALLROOT ?= ${PREFIX}
 
-ifeq ($(INSTALLROOT),)
-	INSTALLROOT = /usr/local
-endif
-
 INSTALLDIR = $(INSTALLROOT)/bin
-SINSTALLDIR ?= $(INSTALLDIR)
-MANDIR ?= $(INSTALLROOT)/share/man/man1
-SMANDIR ?= $(MANDIR)
+SINSTALLDIR ?= $(INSTALLROOT)/sbin
+MANDIR ?= $(INSTALLROOT)/man/man1
+SMANDIR ?= $(INSTALLROOT)/man/man1
 MANMODE = 644
 MANDIRMODE = 755
 INCLUDEDIR = $(INSTALLROOT)/include
