[MacPorts] #48608: R: add variant for gcc5 and make it the default

[MacPorts]

#48608: R: add variant for gcc5 and make it the default
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 Reporter:  ryandesign@…  |      Owner:  kjell.konis@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:
 Keywords:                |       Port:  R
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 The R port has variants for using gfortran from gcc versions 4.5 through
 4.9 inclusive, with 4.8 being the default. Could a variant for using
 gfortran from the gcc5 port be added, and made the default? gcc5 is the
 latest stable version of gcc.

 Perhaps this is also an opportunity to switch to using the compilers 1.0
 portgroup, instead of creating the variants manually.

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Ticket URL: <https://trac.macports.org/ticket/48608>
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