Index: tahconfig.pm
===================================================================
--- tahconfig.pm	(revision 9373)
+++ tahconfig.pm	(working copy)
@@ -288,6 +288,15 @@
     {
         $cmd=$Config->get("pngnq");
         my $PngnqV=`\"$cmd\" -V 2>&1`;
+	
+	# Deal with Debian/Ubuntu bug in pngnq V 0.5
+	if ($PngnqV =~ /pngnq.+\(null\)/) {
+	    my $dpkg = "/usr/bin/dpkg";
+	    if (-x $dpkg) {
+		$PngnqV=`\"$dpkg\" -l pngnq 2>&1` ;
+	    }
+	}
+
         if ($PngnqV !~ /pngnq.+(\d+\.\d+)/)
         {
             print "! Can't find pngnq (using \"".$Config->get("pngnq")."\")\n";