GTK2 is EOL (end of life) for about 5 years and Arch is very actively removing mostly everything depending on it.
Mabox packages affected:
- pcmanfm(-gtk3)
- lxtask(-gtk3)
- lxappearance(-gtk3)
- lxappearance-obconf(-gtk3)
- lxrandr(-gtk3)
- lxinput(-gtk3)
- gkrellm
- viewnior?
Links: