--- GT/Dependency.pm	2004-08-19 17:13:23.000000000 +0200
+++ ../GT/Dependency.pm	2004-08-24 11:48:17.000000000 +0200
@@ -96,6 +96,7 @@
 sub add_arg_dependency {
     DFEATURE my $f;
     my ($self, $argnum, $nbdays) = @_;
+    return if $self->{'args'}->is_constant($argnum);
     my $object = $self->{'args'}->get_arg_object($argnum);
     ref($object) =~ /^GT::Indicators/ and $self->add_indicator_dependency($object, $nbdays);
     ref($object) =~ /^GT::Signals/ and $self->add_signal_dependency($object, $nbdays);