gtk2 is in the repos: https://archlinux.org/packages/extra/x86_64/gtk2/
You could install it as you would install any other package in EnOS/Arch using pacman
gtk2 is in the repos: https://archlinux.org/packages/extra/x86_64/gtk2/
You could install it as you would install any other package in EnOS/Arch using pacman