Mac warning about OSAtomicIncrement64Barrier

[chrisdembia]

I get the following warning on macOS 10.13.3:

/Users/chris/repos/opensim-core/2/opensim-core/dependencies/BTK/Code/Common/btkO
bject.cpp:100:40: warning: 
      'OSAtomicIncrement64Barrier' is deprecated: first deprecated in macOS
      10.12 - Use std::atomic_fetch_add() from <atomic> instead
      [-Wdeprecated-declarations]    
    this->m_Timestamp = (unsigned long)OSAtomicIncrement64Barrier(&_atom...
                                       ^    
/usr/include/libkern/OSAtomicDeprecated.h:269:9: note: 
      'OSAtomicIncrement64Barrier' has been explicitly marked deprecated here
int64_t OSAtomicIncrement64Barrier( volatile OSAtomic_int64_aligned64_t ...

Clang version:

Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin17.4.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

[curcify]

Can you it work on Macos 10.15?