AquaTerm support is dependent on availability of aquaterm package. However if no options are given to brew install gnuplot, the bottled version is used, without aquaterm, even if aquaterm is available.
OK. I guess Aquaterm should default to off then to handle this case (as there's no Aquaterm on the build machines).
gnuplot: make aquaterm support default to off.
Needed for the bottle to behave as expected.