[MacPorts] #57085: glm @0.9.9.0: build fails on 10.8 and earlier

[MacPorts]

#57085: glm @0.9.9.0: build fails on 10.8 and earlier
----------------------+----------------------
  Reporter:  dbevans  |      Owner:  mamoll
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  glm      |
----------------------+----------------------

Comment (by kencu):

 Probably. On my 10.6.8 / libc++ system that builds everything with
 clang-3.9, it installed without issue:
 {{{
 $ port -v installed glm
 The following ports are currently installed:
   glm @0.9.9.0_0 (active) platform='darwin 10' archs='noarch'
 date='2018-07-13T16:12:25-0700'
 }}}

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Ticket URL: <https://trac.macports.org/ticket/57085#comment:1>
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