The dmg file consists of a gmic command-line-interfaces (cli) and two builds of gmic_gimp plugins.
The cli (/Volumes/Macgmic/cli/gmic) is linked against MacPorts. Users of the cli need installed MacPorts at standard location /opt/local !
The gimp gmic plugins (/Volumes/Macgmic/gimp/gmic_gimp_gtk for Gimp from
rspw. gmic_gimp_ngtk) for Gimp from GIMP
are linked against libraries in the respective Gimp.app bundle using the mechanism adoped there in.
Gimp from GIMPonOSX is creating upon start a symbolic link under /tmp/skl/Gimp! Gimp from GIMP.org uses a different mechanism not relying on the method stated above.
Typical Gimp users have only to copy the plugin gmic_gimp_gtk resp. gmic_gimp_ngtk to the user plugins folder set in the Gimp preferences! Unluckily only one of the two plugins should reside in the plugins folder, Gimp builds are using the same set of preferences!
Gimp users take care using the referenced Gimp build, actually 2.8.14 for the stable build and 2.8.18 from GIMPonOSX (see Downloads) rspw. 2.8.20, from GIMP for the git builds!
For information or problems, send mail to karo<zero><three>de at gmail dot com.