Duncan,
that is not your fault, this flag is used by the release and hence should not 
be flagged by the check system. Thanks for reporting, I'll look into it.
Thanks,
Simon




> On 21/04/2020, at 3:51 AM, Duncan Murdoch <murdoch.dun...@gmail.com> wrote:
> 
> I've just installed R version 4.0.0 RC (2020-04-18 r78249) and am checking a 
> package on MacOS High Sierra (10.13.6).  I can't install the recommended 
> version of Xcode on this MacOS version.  I'm currently using Xcode 9.2.  (I 
> think Xcode 10.x is supposed to work on High Sierra, but it isn't obvious how 
> to update.)
> 
> My package has a small amount of C code, and R CMD check is clean, but R CMD 
> check --as-cran gives this NOTE:
> 
> * checking compilation flags used ... NOTE
> Compilation used the following non-portable flag(s):
>  ‘-mmacosx-version-min=10.13’
> 
> I didn't supply that, it's the default, so probably this note should not 
> appear (even though the message is true).
> 
> Duncan Murdoch
> 
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