=== modified file 'intltool-update.in'
--- intltool-update.in	2014-05-14 02:15:53 +0000
+++ intltool-update.in	2017-12-05 10:34:44 +0000
@@ -1068,7 +1068,9 @@
 	my $untouched = $1;
 	my $sub = "";
         # Ignore recursive definitions of variables
-        $sub = $varhash{$2} if defined $varhash{$2} and $varhash{$2} !~ /\${?$2}?/;
+        my $m2 = $2;
+        my $var2 = $varhash{$m2};
+        $sub = $var2 if defined $var2 and $var2 !~ /\$\{?\Q$m2\E\}?/;
 
 	return SubstituteVariable ("$untouched$sub$rest");
     }