[MacPorts] #39094: gnuplot: use elisp PortGroup

[MacPorts]

#39094: gnuplot: use elisp PortGroup
------------------------+---------------------
 Reporter:  mojca@…     |      Owner:  mojca@…
     Type:  submission  |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.1.3
 Keywords:              |       Port:  gnuplot
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 Use elisp PortGroup (see #39019) for GnuPlot.

 I'm submitting this before committing so that others can check if I made
 any mistake:

 {{{
 variant emacs description "An emacs mode for working with gnuplot" {
     depends_build-append    port:${emacs_binary_provider}
     configure.env-append    EMACS=${emacs_binary}
     configure.args-delete   --without-lisp-files
     configure.args-append   --with-lisp-files --with-
 lispdir=${emacs_lispdir}
 }
 }}}

 Just curious: why is it suggested to use "path:" rather than "port:" to
 specify the dependency?

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Ticket URL: <https://trac.macports.org/ticket/39094>
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