my ($name,$anc,$desc) = cleanup_ctn($1);
# build the tree, checking for name conflict
- die "ERROR: Category name conflict: $name used several times\n"
+ die "ERROR: Category name conflict: $name used several times (in $ancestor{$name} and $anc, last time in $filename)\n"
if defined ($ancestor{$name}) && $ancestor{$name} ne $anc &&
defined ($desc{$name}) && $desc{$name} ne $desc;
$ancestor{$name}=$anc;