[MacPorts] #55813: clhep: fails to build on legacy systems

[MacPorts]

#55813: clhep: fails to build on legacy systems
---------------------+-------------------
  Reporter:  mojca   |      Owner:  mojca
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  clhep   |
---------------------+-------------------

Comment (by ryandesign):

 With the switch to the cxx11 1.1 portgroup, this line is wrong:

 {{{
 configure.ldflags-append -stdlib=libc++
 }}}

 May I suggest instead:

 {{{
 configure.ldflags-append -stdlib=${configure.cxx_stdlib}
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55813#comment:1>
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