Xcode 11 on Mojave (was: libSystem not found using gfortran)

[Joshua Root]

Xcode itself only contains a 10.15 SDK, but the Command Line Tools have
a 10.14 one. You should be mostly fine with them installed, though there
are some exceptions. Our installation instructions have always said to
install both Xcode and the CLTs.

- Josh

Chris Jones wrote:
> yes, as it only has the 10.15 SDK, different to the 10.14 one Xcode 10 
> has, which the buildbots use.
> 
> On 11/10/2019 2:56 pm, Richard L. Hamilton wrote:
>> Is Xcode 11.1 still a bad idea on Mojave?