libmagick++-6-headers 8:6.9.7.4+dfsg-16ubuntu6 (amd64 binary) in ubuntu bionic

 The Magick++ library is a set of C++ wrapper classes that provides access
 to the ImageMagick package functionality from within a C++ application.
 .
 This package includes header files needed to compile
 programs using Magick++.
 .
 This package is independent of channel depth.