[MacPorts] #54333: ffmpeg-devel @20170615_0 does not build on Mac OS X 10.6.8, Snow Leopard, because of missing vda_framework pthreads

[MacPorts]

#54333: ffmpeg-devel @20170615_0 does not build on Mac OS X 10.6.8, Snow Leopard,
because of missing vda_framework pthreads
---------------------------+-------------------------
  Reporter:  ballapete     |      Owner:
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.4.1
Resolution:                |   Keywords:  snowleopard
      Port:  ffmpeg-devel  |
---------------------------+-------------------------

Comment (by ballapete):

 Trying to build without `--enable-vda` leads to another failure:

 {{{
 cd
 /opt/local/var/macports/build/_opt_local_var_macports_sources_nue.de.rsync.macports.org_macports_release_tarballs_ports_lang_llvm-4.0/llvm-4.0/work/build/lib/MC/MCParser
 && /opt/local/bin/cmake -E cmake_link_script
 CMakeFiles/LLVMMCParser.dir/link.txt --verbose=ON
 /Developer/usr/bin/libtool -static  -o ../../libLLVMMCParser.a
 CMakeFiles/LLVMMCParser.dir/AsmLexer.cpp.o
 CMakeFiles/LLVMMCParser.dir/AsmParser.cpp.o
 CMakeFiles/LLVMMCParser.dir/COFFAsmParser.cpp.o
 CMakeFiles/LLVMMCParser.dir/DarwinAsmParser.cpp.o
 CMakeFiles/LLVMMCParser.dir/ELFAsmParser.cpp.o
 CMakeFiles/LLVMMCParser.dir/MCAsmLexer.cpp.o
 CMakeFiles/LLVMMCParser.dir/MCAsmParser.cpp.o
 CMakeFiles/LLVMMCParser.dir/MCAsmParserExtension.cpp.o
 CMakeFiles/LLVMMCParser.dir/MCTargetAsmParser.cpp.o
 /Developer/usr/bin/libtool: object:
 CMakeFiles/LLVMDemangle.dir/ItaniumDemangle.cpp.o
 /Developer/usr/bin/libtool: object:
 CMakeFiles/LLVMMCParser.dir/AsmLexer.cpp.o malformed object (unknown load
 command 2)
 malformed object (unknown load command 2)
 /Developer/usr/bin/libtool: object:
 CMakeFiles/LLVMMCDisassembler.dir/MCExternalSymbolizer.cpp.o malformed
 object (unknown load command 2)
 make[2]: *** [lib/libLLVMDemangle.a] Error 1
 make[2]: Leaving directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_nue.de.rsync.macports.org_macports_release_tarballs_ports_lang_llvm-4.0/llvm-4.0/work/build'
 make[1]: *** [lib/Demangle/CMakeFiles/LLVMDemangle.dir/all] Error 2
 make[1]: *** Waiting for unfinished jobs....
 }}}

--
Ticket URL: <https://trac.macports.org/ticket/54333#comment:1>
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Ports system for macOS