diff --git a/Makefile.am b/Makefile.am
index f5c82fb98a..11bb1e7148 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -454,7 +454,7 @@ support:
 	@cp support-d/.emacs ~
 	@cp support-d/.screenrc ~
 	@cp support-d/.bashrc ~
-	@sh support-d/install-cc-mode.sh
+	@test -f ~/.cc-mode-installed || sh support-d/install-cc-mode.sh && touch ~/.cc-mode-installed
 
 # Special targets