MarsSeed [1] filed a deletion request for gnuplot4 [2]: Dependency chain (of wxgtk2.8) is broken. The latest version of this utility software is available in Arch/extra repo, and provides more features, not less.
Also AUR has GUI-less variants, for interactive CLI usage (AUR/gnuplot-nogui) as well as headless (scripted) usage (AUR/gnuplot- headless). [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/gnuplot4/
