diff --git a/[refs] b/[refs]
index a8b847dd61ed..ace1bcf2508e 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d9a7a2bd07ed3b838d95559d547061afcf3e45f6
+refs/heads/master: f9d490ab374236a115440c771ecf0fb2890eb929
diff --git a/trunk/scripts/checkincludes.pl b/trunk/scripts/checkincludes.pl
index 32ebff659fcc..4bff13985ebd 100755
--- a/trunk/scripts/checkincludes.pl
+++ b/trunk/scripts/checkincludes.pl
@@ -3,6 +3,15 @@
 # checkincludes: Find files included more than once in (other) files.
 # Copyright abandoned, 2000, Niels Kristian Bech Jensen <nkbj@image.dk>.
 
+sub usage {
+	print "Usage: checkincludes.pl <file list>\n";
+	exit 1;
+}
+
+if ($#ARGV < 0) {
+        usage();
+}
+
 foreach $file (@ARGV) {
 	open(FILE, $file) or die "Cannot open $file: $!.\n";