No, I hadn't. Since GraphicsMagick is not very widely used, I had assumed the
library would be detected dynamically. I very much appreciate the work that goes
into creating a package like Krita, but having to recompile KOffice, and therefore
lose automatic package updates through apt/yum, is going to be too time-consuming
of a compromise to work for me. I believe I will wait until either GraphicsMagick
appears in a distribution that I like, or until ImageMagick stabilies their API
enough for the Krita developers to switch back to it.
Thanks for your help.