[MacPorts] #67328: py27-greenlet: error: overloaded 'operator<<' must have at least one parameter of class or enumeration type

[MacPorts]

#67328: py27-greenlet: error: overloaded 'operator<<' must have at least one
parameter of class or enumeration type
------------------------+-------------------------
 Reporter:  ryandesign  |      Owner:  stromnov
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.8.1
 Keywords:              |       Port:  py-greenlet
------------------------+-------------------------
 py27-greenlet fails to build on El Capitan and earlier:

 {{{
 In file included from src/greenlet/greenlet.cpp:19:
 In file included from src/greenlet/greenlet_internal.hpp:20:
 src/greenlet/greenlet_greenlet.hpp:635:16: error: overloaded 'operator<<'
 must have at least one parameter of class or enumeration type
 void greenlet::operator<<(const PyThreadState *const lhs, T& rhs)
                ^
 src/greenlet/greenlet.cpp:1500:31: note: in instantiation of function
 template specialization 'greenlet::operator<<<_ts *>' requested here
         current->python_state << tstate;
                               ^
 1 error generated.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/67328>
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