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vifm: set mainProgram = vifm
Without the change `vifm-full` can't be ran as:
$ nix run -f. vifm-full
error: unable to execute '...-vifm-full-0.14/bin/vifm-full': No such file or directory
With the change both of the above run fine:
$ nix run -f. vifm
$ nix run -f. vifm-full