diff -Naur a/man/Makefile.in b/man/Makefile.in
--- a/man/Makefile.in	1995-06-16 08:19:24.000000000 +0200
+++ b/man/Makefile.in	2009-02-06 01:08:20.000000000 +0100
@@ -33,9 +33,9 @@
 INSTALL_DATA = @INSTALL_DATA@
 PIC = @PIC@
 
-prefix = @prefix@
-man1dir = $(prefix)/man/man1
-man5dir = $(prefix)/man/man5
+mandir = @mandir@
+man1dir = $(DESTDIR)$(mandir)/man1
+man5dir = $(DESTDIR)$(mandir)/man5
 man1ext = .1
 man5ext = .5
 
diff -Naur a/src/Makefile.in b/src/Makefile.in
--- a/src/Makefile.in	1995-06-16 08:19:24.000000000 +0200
+++ b/src/Makefile.in	2009-02-06 00:43:23.000000000 +0100
@@ -110,11 +110,11 @@
 	$(CC) -c $(ALL_CFLAGS) $<
 
 installdirs :: ../mkinstalldirs
-	$(srcdir)/../mkinstalldirs $(bindir)
+	$(srcdir)/../mkinstalldirs $(DESTDIR)$(bindir)
 
 install :: all installdirs
 	for p in $(PROGRAMS); do \
-	  $(INSTALL_PROGRAM) $$p $(bindir)/$$p; \
+	  $(INSTALL_PROGRAM) $$p $(DESTDIR)$(bindir)/$$p; \
 	done
 
 uninstall ::