[MacPorts] #55280: ceres-solver refuses to build under 10.8

[MacPorts]

#55280: ceres-solver refuses to build under 10.8
---------------------------+--------------------------
  Reporter:  SchmollTroll  |      Owner:  mamoll
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.4.2
Resolution:                |   Keywords:  mountainlion
      Port:  ceres-solver  |
---------------------------+--------------------------

Comment (by mamoll):

 @ryandesign, is this the correct change in the Portfile:
 {{{
 if {${configure.cxx_stdlib} eq "libstdc++"} {
     configure.ldflags-append -lstdc++
 } else {
     configure.ldflags-append -lc++
 }
 }}}

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Ticket URL: <https://trac.macports.org/ticket/55280#comment:3>
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