--- Makefile.in.orig	2014-08-15 14:55:42.253003285 +0800
+++ Makefile.in	2014-08-15 14:56:37.571000087 +0800
@@ -33,17 +33,14 @@ sic	: $(OBJS)
 	$(CC) $(CFLAGS) $(OBJS) $(LDFLAGS) $(LIBS) -o sic
 
 install	: all
-	${INSTALL} -d -m 0755 $(bindir)
-	${INSTALL} -m 0755 sic $(bindir)/sic-$(VERSION)
-	if test -f $(bindir)/sic.old; then rm -f $(bindir)/sic.old; fi
-	if test -f $(bindir)/sic; then mv $(bindir)/sic $(bindir)/sic.old; fi
-	@rm -f $(bindir)/sic
-	ln -s $(bindir)/sic-$(VERSION) $(bindir)/sic
-	${INSTALL} -d -m 0755 $(mandir)/man1
-	${INSTALL} -d -m 0755 $(mandir)/man5
-	${INSTALL} -m 0644 man/sic.man $(mandir)/man1/sic.1
-	${INSTALL} -m 0644 man/sic-alias.man $(mandir)/man5/sic-alias.5
-	${INSTALL} -m 0644 man/sic-server.man $(mandir)/man5/sic-server.5
+	${INSTALL} -d -m 0755 $(DESTDIR)$(bindir)
+	${INSTALL} -m 0755 sic $(DESTDIR)$(bindir)/sic-$(VERSION)
+	ln -s sic-$(VERSION) $(DESTDIR)$(bindir)/sic
+	${INSTALL} -d -m 0755 $(DESTDIR)$(mandir)/man1
+	${INSTALL} -d -m 0755 $(DESTDIR)$(mandir)/man5
+	${INSTALL} -m 0644 man/sic.man $(DESTDIR)$(mandir)/man1/sic.1
+	${INSTALL} -m 0644 man/sic-alias.man $(DESTDIR)$(mandir)/man5/sic-alias.5
+	${INSTALL} -m 0644 man/sic-server.man $(DESTDIR)$(mandir)/man5/sic-server.5
 
 man: man/sic.man man/sic-alias.man man/sic-server.man