From Adam Witney: I downloaded a copy of GACK yesterday (gack3631.pl), but I had to make some modifications to get it to run on my Mac OSX 10.3.4 machine. Nothing too major, so I have included a diff below. --- gack3631.pl 2004-06-12 14:15:09.000000000 +0100 +++ gack3631_aaw.pl 2004-06-11 18:10:23.000000000 +0100 @@ -323,10 +323,10 @@ $binout = 0; $outfilefr->Checkbutton(-text=> "Binary output", -variable=> \$binout, - )->grid(-row=>1,-col=>0,-sticky=>'w'); + )->grid(-row=>1,-column=>0,-sticky=>'w'); $outfilefr->Label(-text=> "Binary %EPP Cutoff", - )->grid(-row=>1,-col=>2); + )->grid(-row=>1,-column=>2); $binoutcut = 50; $outfilefr->Scale(-from=>0, @@ -340,11 +340,11 @@ $triout = 0; $outfilefr->Checkbutton(-text=> "Trinary output", -variable=> \$triout, - )->grid(-row=>2,-col=>0,-sticky=>'w'); + )->grid(-row=>2,-column=>0,-sticky=>'w'); $outfilefr->Label(-text=> "Trinary %EPP Cutoff 1", - )->grid(-row=>2,-col=>2); + )->grid(-row=>2,-column=>2); $outfilefr->Label(-text=> "Trinary %EPP Cutoff 2", - )->grid(-row=>3,-col=>2); + )->grid(-row=>3,-column=>2); $trioutcut1 = 0; $trioutcut2 = 100;