This re-opens the possibility that standalone Image::Magick ppm packages can be provided !!
For Image-Magick-6.89, using 8-bit rgb values (quantum depth = 8):
ppm install http://www.sisyphusion.tk/ppm/Image-Magick_.ppd --force
For Image-Magick-6.89, using 16-bit rgb values (quantum depth = 16):
ppm install http://www.sisyphusion.tk/ppm/Image-Magick.ppd --force
They expect to use the ImageMagick-6.9.2 that ships with them (and which is installed seamlessly).
YMMV if attempts are made to use them with another ImageMagick installation.
They both install a module named Image::Magick - which makes it tricky to have both types installed in the same build of perl.
None of this is explained on the repo website (yet) beyond that provided in the post-install scripts
http://www.sisyphusion.tk/ppm/scripts/install_image_magick and
http://www.sisyphusion.tk/ppm/scripts/install_image_magick_
Cheers,
Rob