trend build issues

[Yuri D'Elia <wavexx@users.sf.net>]

Hi everyone. I have some problems with a new package "trend".
See:

  https://buildd.debian.org/~luk/status/package.php?p=trend

some arches build fine, but some are stuck in BD-Uninstallable status.
Why is there a difference?

Also, is it expected that I cannot build-depend on a virtual package?
pbuilder has no problems with it.

On a side note, can you please document the "BD-Uninstallable" state in
the Debian website?

  http://www.debian.org/devel/buildd/wanna-build-states

Thanks