Index: source/tools/entity/checkrefs.pl
===================================================================
--- source/tools/entity/checkrefs.pl
+++ source/tools/entity/checkrefs.pl
@@ -4,9 +4,13 @@
 use File::Find;
 use XML::Simple;
 use JSON;
+use Getopt::Std;
 
 use Entity;
 
+my %options=();
+getopts("u", \%options);
+
 use constant CHECK_MAPS_XML => 0;
 use constant ROOT_ACTORS => 1;
 
@@ -578,4 +582,4 @@
 print "\n";
 check_deps();
 print "\n";
-check_unused();
+check_unused() if defined $options{u};