Packages kept back on woody

[Laurent de Segur <ldesegur@mac.com>]

Hi,

I was doing my usual weekend apt-get update/apt-get upgrade this morning on
testing and the upgrade stated that 3 packages (autoconf, lib-xt-java, and
mailtools) have been kept back.

As I haven't done absolutely nothing to these packages or their respective
installed files, I wonder why this is happening.

Thanks for your help,

Laurent