<div dir="ltr">Beyond the /usr/include issue, Xcode 11 should be problematic when its bundled 10.15 SDK is used under either Mojave or Catalina due to the enforced use of the availability attribute in the headers.<div><br><div><a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90835">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90835</a><br></div><div><br></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Sep 25, 2019 at 5:46 AM Chris Jones <<a href="mailto:jonesc@hep.phy.cam.ac.uk">jonesc@hep.phy.cam.ac.uk</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
>> (*) The package to add back /usr/include currently does not exist in <br>
>> 10.15 beta, so unless it reappears come final release this is going to <br>
>> be more of a problem thereā¦.<br>
> <br>
> This package is not going to be coming back: <br>
> <a href="https://developer.apple.com/documentation/xcode_release_notes/xcode_10_release_notes#3035623" rel="noreferrer" target="_blank">https://developer.apple.com/documentation/xcode_release_notes/xcode_10_release_notes#3035623</a><br>
> <br>
<br>
Indeed, it is not at all unexpected to no longer have this option with <br>
Xcode 11.<br>
</blockquote></div>