Linking failure on aarch64

[Hans Åberg]

> On 2 Jul 2020, at 21:23, Torbjörn Granlund <tg at gmplib.org> wrote:
> 
> Hans Åberg <haberg-1 at telia.com> writes:
> 
>  So here it should be
>    xcode-select --switch /Applications/Xcode-beta.app/Contents/Developer
> 
> Sorry, I must have been unclear.  I lacked installation instructions for
> how to get /Applications/Xcode-beta.app installed.  My problem was not
> adding features to the beta compiler.  My probles was getting from .xip
> file to the /Applications/Xcode-beta.app.

I double-clicked on it, the Universal Apps beta, taking several minutes to verify and unpack, and then dragged it to /Applications/. There is also an article here [1].
https://osxdaily.com/2018/11/02/open-extract-xip-file-mac/