argh blacklist { clang < 500 }, I meant On 2017-09-29, at 11:47 AM, Ken Cunningham wrote: >> But similar to cxx11 1.0, it doesn't do much on systems using libc++, i.e. 10.9 or later. >> > > The only thing it does if libc++ is selected is blacklist { clang > 500 } and *gcc* > > Ken