-

Error:dyld: lazy symbol binding failed: Symbol not found: _futimens
  Referenced from: /usr/local/opt/emscripten/libexec/llvm/bin/llvm-ar
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: _futimens
  Referenced from: /usr/local/opt/emscripten/libexec/llvm/bin/llvm-ar
  Expected in: /usr/lib/libSystem.B.dylib

0  llvm-ar                  0x000000010bb4c241 llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 37
1  llvm-ar                  0x000000010bb4b8fb llvm::sys::RunSignalHandlers() + 83
2  llvm-ar                  0x000000010bb4c649 SignalHandler(int) + 226
3  libsystem_platform.dylib 0x00007fffe946eb3a _sigtramp + 26
4  libsystem_platform.dylib 0x00000001105cfb4d _sigtramp + 655757357
5  libsystem_platform.dylib 0x00000001105da464 _sigtramp + 655800644
6  libsystem_platform.dylib 0x00000001105b5793 _sigtramp + 655649907
7  libsystem_platform.dylib 0x00000001105b589e _sigtramp + 655650174
8  libdyld.dylib            0x00007fffe925b282 dyld_stub_binder + 282
9  llvm-ar                  0x000000010bd48340 (anonymous namespace)::DarwinX86AsmBackend::getCompactUnwindRegNum(unsigned int) const::CU64BitRegs + 15656
10 llvm-ar                  0x000000010ba6ef9c performOperation(ArchiveOperation, llvm::object::Archive*, std::__1::unique_ptr<llvm::MemoryBuffer, std::__1::default_delete<llvm::MemoryBuffer> >, std::__1::vector<llvm::NewArchiveMember, std::__1::allocator<llvm::NewArchiveMember> >*) + 1703
11 llvm-ar                  0x000000010ba6e5a2 performOperation(ArchiveOperation, std::__1::vector<llvm::NewArchiveMember, std::__1::allocator<llvm::NewArchiveMember> >*) + 892
12 llvm-ar                  0x000000010ba6ca3f main + 347
13 libdyld.dylib            0x00007fffe925f235 start + 1
14 libdyld.dylib            0x0000000000000003 start + 383389135
Stack dump:
0.	Program arguments: /usr/local/opt/emscripten/libexec/llvm/bin/llvm-ar xo /Users/j/src/libsodium.js/libsodium/libsodium-js/lib/libsodium.a

Traceback (most recent call last):
  File "/usr/local/bin/emcc", line 13, in <module>
    emcc.run()
  File "/usr/local/Cellar/emscripten/HEAD-c8f6013/libexec/emcc.py", line 1430, in run
    final = shared.Building.link(linker_inputs, DEFAULT_FINAL, force_archive_contents=force_archive_contents, temp_files=misc_temp_files, just_calculate=just_calculate)
  File "/usr/local/Cellar/emscripten/HEAD-c8f6013/libexec/tools/shared.py", line 1772, in link
    Building.read_link_inputs(filter(lambda x: not x.startswith('-'), files))
  File "/usr/local/Cellar/emscripten/HEAD-c8f6013/libexec/tools/shared.py", line 1698, in read_link_inputs
    raise Exception('llvm-ar failed on archive ' + archive_names[n] + '!')
Exception: llvm-ar failed on archive /Users/j/src/libsodium.js/libsodium/libsodium-js/lib/libsodium.a!
make: *** [libsodium/libsodium-js/lib/libsodium-wasm.js] Error 1