[MacPorts] #67641: libopenmpt fail on 10.6–10.12 x86_64: Undefined symbols for architecture x86_64: "typeinfo for std::bad_variant_access"

[MacPorts]

#67641: libopenmpt fail on 10.6–10.12 x86_64: Undefined symbols for architecture
x86_64: "typeinfo for std::bad_variant_access"
--------------------------+------------------------
 Reporter:  barracuda156  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.1
 Keywords:  x86_64        |       Port:  libopenmpt
--------------------------+------------------------
 {{{
 Undefined symbols for architecture x86_64:
   "typeinfo for std::bad_variant_access", referenced from:
       __ZNSt3__126__throw_bad_variant_accessB7v160006Ev in la-
 libopenmpt_impl.o
   "vtable for std::bad_variant_access", referenced from:
       __ZNSt3__126__throw_bad_variant_accessB7v160006Ev in la-
 libopenmpt_impl.o
   NOTE: a missing vtable usually means the first non-inline virtual member
 function has no definition.
 ld: symbol(s) not found for architecture x86_64
 clang: error: linker command failed with exit code 1 (use -v to see
 invocation)
 }}}

 Log:
 https://build.macports.org/builders/ports-10.12_x86_64-builder/builds/234606/steps
 /install-port/logs/stdio

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Ticket URL: <https://trac.macports.org/ticket/67641>
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