For those of us who don't have an ithread perl handy:

--- Sub/Sealed.pm~      2003-12-22 12:20:41.000000000 -0600
+++ Sub/Sealed.pm       2003-12-22 12:28:42.000000000 -0600
@@ -10,7 +10,7 @@
 use Devel::LexAlias qw(lexalias);
 use PadWalker qw(peek_my peek_sub);
 use Storable qw(dclone);
-use Thread::Tie;
+our $Thread = scalar eval "use Thread::Tie; 1 ";

 my $count = 0;

@@ -50,9 +50,11 @@
             while ( my($var,$value) = each %to_save) {
                 my $sigil = substr($var,0,1,"");
                 my $newvar = *{"$pkg$var"}{SCALAR};
-                # $$newvar = $value; # for non-thread-wary results
-                tie $$newvar, 'Thread::Tie', {}, $value;
-
+               if ( $Thread ) {
+                   tie $$newvar, 'Thread::Tie', {}, $value;
+               } else {
+                   $$newvar = $value; # for non-thread-wary results
+                }
                 # the next line is necessary, for some reason
                 $newvar = ${*{"$pkg$var"}{SCALAR}};
                 lexalias($referent, "$sigil$var", $newvar);
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