--- trunk/lib/Frey/Pipe.pm	2008/12/16 20:59:48	861
+++ trunk/lib/Frey/Pipe.pm	2009/01/05 20:56:32	923
@@ -60,6 +60,18 @@
 
 			warn "# pipe $part" if $self->debug;
 			my $o = $self->new_frey_class( $class, $default );
+
+			# XXX copy depends from parts of pipe
+			if ( $o->can('depends') ) {
+				$o->depends;
+				my $current_head;
+				$current_head->{$_} foreach $self->head;
+				foreach ( $o->head ) {
+					next if $current_head->{$_}++;
+					$self->add_head( $_ );
+				}
+			}
+
 			my $result = $o->$method;
 			warn "# result ",length( $result ), " bytes ", ref($result);