[MacPorts] #68148: libgit2 @1.7.1: builds fail with xcode clang 6 and earlier: error: unknown type name 'inline'

[MacPorts]

#68148: libgit2 @1.7.1: builds fail with xcode clang 6 and earlier: error: unknown
type name 'inline'
----------------------+----------------------
  Reporter:  mascguy  |      Owner:  mascguy
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.8.1
Resolution:           |   Keywords:
      Port:  libgit2  |
----------------------+----------------------

Comment (by mascguy):

 Unfortunately blacklisting clang doesn't cut the mustard either. Do we
 need to patch the project's CMake files, and specify the C standard as 99?
 Or...?

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Ticket URL: <https://trac.macports.org/ticket/68148#comment:2>
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