--- Makefile.in.orig	2014-06-14 22:09:43.102302676 +0800
+++ Makefile.in	2014-06-14 22:11:35.750296619 +0800
@@ -491,31 +491,31 @@ average.out: ftnchek.h
 install:	install-exe @INSTALL_MAN@ install-lisp
 
 install-exe:	ftnchek$(EXE) dcl2inc$(CMD)
-	-$(RM) $(bindir)/ftnchek$(EXE)
-	-$(MKDIR) -p $(bindir)
-	$(CP) ftnchek$(EXE) $(bindir)
-	-$(STRIP) $(bindir)/ftnchek$(EXE)
-	$(CHMOD) 755 $(bindir)/ftnchek$(EXE)
-	-$(MKDIR) -p $(libdir)
-	$(CP) dcl2inc.awk $(libdir)/dcl2inc.awk
-	$(CHMOD) 644 $(libdir)/dcl2inc.awk
-	$(CP) dcl2inc$(CMD) $(bindir)/dcl2inc$(CMD)
-	$(CHMOD) 755 $(bindir)/dcl2inc$(CMD)
-	-$(RM) $(bindir)/fcl2vcg
+	-$(RM) $(DESTDIR)$(bindir)/ftnchek$(EXE)
+	-$(MKDIR) -p $(DESTDIR)$(bindir)
+	$(CP) ftnchek$(EXE) $(DESTDIR)$(bindir)
+	-$(STRIP) $(DESTDIR)$(bindir)/ftnchek$(EXE)
+	$(CHMOD) 755 $(DESTDIR)$(bindir)/ftnchek$(EXE)
+	-$(MKDIR) -p $(DESTDIR)$(libdir)
+	$(CP) dcl2inc.awk $(DESTDIR)$(libdir)/dcl2inc.awk
+	$(CHMOD) 644 $(DESTDIR)$(libdir)/dcl2inc.awk
+	$(CP) dcl2inc$(CMD) $(DESTDIR)$(bindir)/dcl2inc$(CMD)
+	$(CHMOD) 755 $(DESTDIR)$(bindir)/dcl2inc$(CMD)
+	-$(RM) $(DESTDIR)$(bindir)/fcl2vcg
 
 # Install man pages, taking care to remove old formatted ones, because
 # many man implentations fail to compare time stamps of raw and
 # formatted files, and will show out-of-date formatted files.
 install-man: ftnchek$(manext)
-	-$(MKDIR) -p $(mandir)/man1
-	$(CP) dcl2inc.man $(mandir)/man1/dcl2inc$(manext)
-	-$(RM) $(mandir)/cat1/dcl2inc$(manext)
-	$(CHMOD) 644 $(mandir)/man1/dcl2inc$(manext)
-	$(CP) ftnchek$(manext) $(mandir)/man1/ftnchek$(manext)
-	-$(RM) $(mandir)/cat1/ftnchek$(manext)
-	$(CHMOD) 644 $(mandir)/man1/ftnchek$(manext)
-	-$(RM) $(mandir)/man1/fcl2vcg$(manext)
-	-$(RM) $(mandir)/cat1/fcl2vcg$(manext)
+	-$(MKDIR) -p $(DESTDIR)$(mandir)/man1
+	$(CP) dcl2inc.man $(DESTDIR)$(mandir)/man1/dcl2inc$(manext)
+	-$(RM) $(DESTDIR)$(mandir)/cat1/dcl2inc$(manext)
+	$(CHMOD) 644 $(DESTDIR)$(mandir)/man1/dcl2inc$(manext)
+	$(CP) ftnchek$(manext) $(DESTDIR)$(mandir)/man1/ftnchek$(manext)
+	-$(RM) $(DESTDIR)$(mandir)/cat1/ftnchek$(manext)
+	$(CHMOD) 644 $(DESTDIR)$(mandir)/man1/ftnchek$(manext)
+	-$(RM) $(DESTDIR)$(mandir)/man1/fcl2vcg$(manext)
+	-$(RM) $(DESTDIR)$(mandir)/cat1/fcl2vcg$(manext)
 
 # IRIX uses pre-formatted, packed man pages and nroff is not bundled with it.
 install-man-sgi: catman
@@ -558,16 +558,16 @@ catman: dcl2inc.cat ftnchek.cat
 #  The emacs lisp file will be installed only if lispdir exists.  It will
 #  be byte-compiled if emacs is present.
 install-lisp:
-	@if test -d "$(lispdir)" ; \
+	@if test -d "$(DESTDIR)$(lispdir)" ; \
 	then \
-	  echo $(CP) ftnchek.el $(lispdir)/ftnchek.el ; \
-	  if $(CP) ftnchek.el $(lispdir)/ftnchek.el ; \
+	  echo $(CP) ftnchek.el $(DESTDIR)$(lispdir)/ftnchek.el ; \
+	  if $(CP) ftnchek.el $(DESTDIR)$(lispdir)/ftnchek.el ; \
 	  then \
 	     if test -x "$(EMACS)" ; \
 	     then \
-	       $(EMACS) -batch -f batch-byte-compile $(lispdir)/ftnchek.el ; \
+	       $(EMACS) -batch -f batch-byte-compile $(DESTDIR)$(lispdir)/ftnchek.el ; \
 	     else \
-	       echo "If desired, use emacs to byte-compile $(lispdir)/ftnchek.el"; \
+	       echo "If desired, use emacs to byte-compile $(DESTDIR)$(lispdir)/ftnchek.el"; \
 	     fi \
 	  fi \
 	else \