stdlib.h compilation error for macports gcc9.

Ken Cunningham ken.cunningham.webuse at
Sun Feb 7 23:57:48 UTC 2021

Our fix changed the baked-in gcc SDK reference from using the 
MacOSX11.x  and above  to MacOSX.sdk. that fixes a number of broken 
systems, but not all it appears.

Perhaps we should find a way to broaden that down to including 
MacOSX10.15+ as well, if Catalina is going to be using the MacOSX11.x SDK.

Luckily it appears our previous fix was not responsible for this -- just 
not broad enough to fix even more issues people have.

And -- baking the SDK into gcc at all is just a pain. It should just use 
SDKROOT and it was supposed to do that after Iain's fixes.


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