graphicsmagick-libmagick-dev-compat binary package in Ubuntu Focal arm64

 GraphicsMagick provides libraries in several programming languages to read,
 write and manipulate image files across a large number of formats, from the
 widely used jpeg, tiff, bmp or xpm to special-purpose formats such as fits or
 image formats found on some photo CDs. There are functions for finegrained
 image processing tasks, as well as conversion routines between the various
 image formats.
 .
 The GraphicsMagick libraries are a fork of ImageMagick and therefore offer
 programming interfaces that are mostly compatible. While there might be
 small differences, experience tells that many programs only use a compatible
 subset and build fine with either GraphicsMagick or ImageMagick.
 .
 While GraphicsMagick uses different names for libraries, classes, and
 helper applications in order to coexist with ImageMagick, this package
 intends to minimise porting efforts by exporting the GraphicsMagick
 interface with the usual ImageMagick names. Note that this package only
 tries to provide build-time compatibility. Run-time libraries of
 ImageMagick and GraphicsMagick are incompatible and cannot be interchanged.
 .
 This package includes compatibility wrappers for the C, C++, and Perl
 libraries.

Source package