* László Böszörményi (GCS) <g...@debian.org>, 2015-09-22, 08:25:
[2] dget -x http://www.barcikacomp.hu/gcs/graphicsmagick_1.3.21-4.dsc
You changed the package name, but not the SONAME. That doesn't sound right.
Changing the SONAME should be a matter of passing --enable-quantum-library-names to configure, as suggested by Bob Friesenhahn in #795102.
Also, now might be a good moment to move libGraphicsMagickWand to a seperate binary package.
-- Jakub Wilk