diff -up mozilla/mail/app/Makefile.in.old mozilla/mail/app/Makefile.in
--- mozilla/mail/app/Makefile.in.old	2007-02-28 07:52:59.000000000 +0100
+++ mozilla/mail/app/Makefile.in	2007-09-26 16:53:51.000000000 +0200
@@ -257,7 +257,7 @@ libs:: thunderbird
 	$(INSTALL) $< $(DIST)/bin
 
 install:: thunderbird
-	$(SYSINSTALL) $< $(DESTDIR)$(bindir)
+	$(SYSINSTALL) $< $(DESTDIR)$(mozappdir)
 
 GARBAGE += thunderbird
 GARBAGE += $(addprefix $(DIST)/bin/defaults/pref/, all.js all-thunderbird.js channel-prefs.js mailnews.js)