Index: trunk/tools/dlapstacks
===================================================================
--- trunk/tools/dlapstacks	(revision 33522)
+++ trunk/tools/dlapstacks	(revision 33523)
@@ -68,6 +68,10 @@
 my $missing_tools;
 my $ppstamp;
+my $ds9;
 if ($deasin) {
     $ppstamp = can_run('ppstamp') or (warn "Can't find ppstamp") and $missing_tools = 1;
+}
+if (!$no_display) {
+    $ds9 = can_run('ds9') or (warn "Can't find ds9") and $missing_tools = 1;
 }
 if ($missing_tools) {
@@ -263,5 +267,5 @@
         push @args, $filename;
     }
-    my $ds9cmd = "ds9 -geom 1024x1024 @args $panargs";
+    my $ds9cmd = "$ds9 -geom 1024x1024 @args $panargs";
     $ds9cmd .= " -single" if $singleframe;
     $ds9cmd .= " -zoom to fit" if $fitToFrame;