Index: trunk/build/Build.pm
===================================================================
--- trunk/build/Build.pm (revision 1681)
+++ trunk/build/Build.pm (revision 3082)
@@ -152,5 +152,5 @@
     ($self->{'short-lang=s'} = $self->{'lang=s'}) =~ s/([a-z]{2})_[A-Z]{2}$/$1/o;
 
-    $self->{'pack=s'} ||= 'MT';
+    $self->{'pack=s'} ||= 'MTOS';
     $ENV{BUILD_PACKAGE}  = $self->{'pack=s'};
     $ENV{BUILD_LANGUAGE} = $self->{'lang=s'};