Installing G'MIC Plugin in GIMP in Arch Linux
Installing GMIC Plugin in GIMP using pacman in Arch Linux
If you have already installed GIMP you can install G'MIC Plugin with pacman
pacman -S gimp-plugin-gmic
If you have not installed GIMP first install GIMP and then install G'MIC Plugin
pacman -S gimp
pacman -S gimp-plugin-gmic