[MacPorts] #43729: ld64 @236.3_1: build failure on 10.8 and earlier

[MacPorts]

#43729: ld64 @236.3_1: build failure on 10.8 and earlier
----------------------+------------------------
 Reporter:  devans@…  |      Owner:  jeremyhu@…
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:            |       Port:  ld64
----------------------+------------------------
 When building on OS X 10.8 and earlier build fails as follows:

 {{{
 /usr/bin/clang++ -Os -Os -stdlib=libstdc++ -arch x86_64
 -I/opt/local/libexec/llvm-3.3/include -DLTO_SUPPORT -Isrc/abstraction
 -Isrc/ld -Isrc/ld/parsers -I/opt/local/include  -c -o src/other/dyldinfo.o
 src/other/dyldinfo.cpp
 In file included from src/other/ObjectDump.cpp:35:
 In file included from src/ld/parsers/macho_relocatable_file.h:28:
 src/ld/ld.hpp:35:10: fatal error: 'unordered_set' file not found
 #include <unordered_set>
          ^
 In file included from src/ld/parsers/macho_relocatable_file.cpp:50:
 src/ld/ld.hpp:35:10: fatal error: 'unordered_set' file not found
 #include <unordered_set>
          ^
 In file included from src/ld/parsers/lto_file.cpp:42:
 src/ld/ld.hpp:35:10: fatal error: 'unordered_set' file not found
 #include <unordered_set>
          ^
 1 error generated.
 make: *** [src/other/ObjectDump.o] Error 1
 }}}

 Observed locally and on buildbots.
 Build log (10.8) attached.

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Ticket URL: <https://trac.macports.org/ticket/43729>
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