This change explicitly enables support for `libgd` and the lua
terminal in `gnuplot`, while explicitly disabling `cairo` terminals,
which don't work with our `cairo` port. Adding `libgd` as a
dependency requires us to manually link against the dependencies of
`libgd`, as this is not done automatically by the configure script.
This fixes an issue where building `gnuplot` would fail if `libgd`
was already installed.
We may need entries with spaces in makeopts, installopts, and
configopts, and at that point we should also convert depends and
auth_opts to avoid confusion.
- Replaced /Root with
- Improved documentation.
- Removed a few typos.
- Replaced with
- Added brackets in some cases.
Most of the changes were reviewed and applied manually.
Obviously we don't support many of the common terminals as we're missing
X11, Qt, WxWidgets, Cairo etc. - but at least the "dumb" terminal
(ASCII output) and "canvas" terminal (generates JS to plot on a HTML
<canvas>) are confirmed to be working :^)
