[MacPorts] #67776: PDAL fails to build on 10.6.8: Undefined symbols for architecture x86_64: "___cxa_thread_atexit"

[MacPorts]

#67776: PDAL fails to build on 10.6.8: Undefined symbols for architecture x86_64:
"___cxa_thread_atexit"
--------------------------+----------------------
 Reporter:  barracuda156  |      Owner:  Veence
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.1
 Keywords:  snowleopard   |       Port:  PDAL
--------------------------+----------------------
 See:
 https://build.macports.org/builders/ports-10.6_x86_64-builder/builds/159320/steps
 /install-port/logs/stdio
 {{{
 Undefined symbols for architecture x86_64:
   "___cxa_thread_atexit", referenced from:
       pdal::BOX2D::parse(std::__1::basic_string<char,
 std::__1::char_traits<char>, std::__1::allocator<char> > const&, unsigned
 long&) in Bounds.cpp.o
       pdal::BOX3D::parse(std::__1::basic_string<char,
 std::__1::char_traits<char>, std::__1::allocator<char> > const&, unsigned
 long&) in Bounds.cpp.o
 ld: symbol(s) not found for architecture x86_64
 clang: error: linker command failed with exit code 1 (use -v to see
 invocation)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/67776>
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