Cannot compile Slicer on Mac - macOS Sierra + clang 9 + cmake 3.9.1

Development
6

If I switch to VTKv8, I get compile error in LibArchive :frowning:

[ 11%] Building C object libarchive/CMakeFiles/archive_static.dir/archive_read_disk_posix.c.o
/Users/fedorov/build/Slicer-Release/LibArchive/libarchive/archive_read_disk_posix.c:1984:6: error: 'futimens' is only available on macOS 10.13 or newer
      [-Werror,-Wunguarded-availability-new]
        if (futimens(fd, timespecs) == 0)
            ^~~~~~~~
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/usr/include/sys/stat.h:373:5: note: 'futimens' has been explicitly marked partial here
int     futimens(int __fd, const struct timespec __times[2]) __API_AVAILABLE(macosx(10.13), ios(11.0), tvos(11.0), watchos(4.0));
        ^
/Users/fedorov/build/Slicer-Release/LibArchive/libarchive/archive_read_disk_posix.c:1984:6: note: enclose 'futimens' in a __builtin_available check to silence this warning
        if (futimens(fd, timespecs) == 0)
            ^~~~~~~~
1 error generated.