--- Makefile.orig	2014-06-09 00:18:35.116823595 +0800
+++ Makefile	2014-06-09 00:19:38.891822142 +0800
@@ -122,8 +122,8 @@ install:	install-bin install-inc install
 		@${ECHO} "Use 'make install-doc' to install documentation."
 
 install-bin:	${TGT}
-		-${MKDIR} ${BINDIR}
-		${INSTALL_PROGRAM} ${TGT} ${BINDIR}
+		-${MKDIR} $(DESTDIR)${BINDIR}
+		${BSD_INSTALL_PROGRAM} ${TGT} $(DESTDIR)${BINDIR}
 
 install-inc:	${TGTLIB}
 #		-${MKDIR} ${INCDIR}
@@ -136,8 +136,8 @@ install-lib:	${TGTLIB}
 install-share:
 
 install-doc:
-		-${MKDIR} ${DOCDIR}/html
-		${INSTALL_DATA} doc/html/*.html doc/html/*.gif ${DOCDIR}/html
+		-${MKDIR} $(DESTDIR)${DOCDIR}/html
+		${BSD_INSTALL_DATA} doc/html/*.html doc/html/*.gif $(DESTDIR)${DOCDIR}/html
 
 ${TGT}:		${TGTLIB} ${MAINOBJ}
 		${CC} ${LFLAGS} -o ${TGT} ${MAINOBJ} ${TGTLIB} ${LIBS}