Bug#795102: libgraphicsmagick1-dev: undefined reference to `Magick::Color::Color(unsigned short, unsigned short, unsigned short)'

[Jakub Wilk]

A quick grep through the sources of rev-deps shows that these packages 
use the PixelPacket structure:

gnudatalanguage
octave
pdf2djvu
python-pgmagick
witty
xastir
I expect them all to be affected by this ABI breakage.

So please don't paper over the problem with Breaks, but either revert 
the QuantumDepth change, or change the SONAME. Thanks. :)

In either case, please talk to the release team first, because they'll 
need to schedule binNMUs.

--
Jakub Wilk