--- Makefile.orig	2014-06-16 17:50:52.201465434 +0800
+++ Makefile	2014-06-16 17:51:18.193462700 +0800
@@ -7,10 +7,9 @@ CFLAGS+=	-Wall -pedantic -std=c99
 CFLAGS+=	-DDEBUG
 .endif
 
-DESTDIR?=	${PREFIX}
-DESTDIR?=	/usr/local
-BINDIR=		/bin
-MANDIR=		/man/man
+PREFIX?=	/usr/local
+BINDIR=		${PREFIX}/bin
+MANDIR=		${PREFIX}/man/man
 
 DISTDIR=	${PROG}-${VERSION}
 TARBALL=        ${DISTDIR}.tar.gz