Do you mean that after installing Mojave you never again managed
> to compile Sage? Do you still have a working version of Sage?
> Which version is that?
>

I no longer  have a working version of sage. 

>
> Have you tried installing the SageMath 8.6 binary for macOS from
>
>     http://www.sagemath.org/download-mac.html
>
> I need the source distribution as  I am developing code (or at least I 
was...)

>
> Have you re-installed XCode after installing macOS 10.14 Mojave?
>
yes 

>
> What is the output of
> ```
> xcode-select --version
>
As noted above I am running:
ProductName:    Mac OS X
ProductVersion:    10.14.2
BuildVersion:    18C54
Xcode 10.1
Build version 10B61
and have already installed xcode andthe system headers,


You could remove the pip tarball in case it is corrupted:
> ``` 
> rm /usr/local/src/sage/upstream/pip-18.1.tar.gz
> rm -rf /usr/local/src/sage/local/var/tmp/sage/build/pip-18.1
> ```
> You could move the old build logs out of the way
> ```
> mv /usr/local/src/sage/logs /usr/local/src/sage/logs-old
>

Good idea. Will try this.

> ```
>
> You could try to make distclean, configure and make:
> ```
> cd /usr/local/src/sage
> make distclean
> make configure
> ./configure
> make
>

Out of curiosity, doesn't make run configure automatically?  

I have tried make distclean && make a few times already but now that you 
mention it I think that last time I had this p=trouble I deleted the build 
directory and the next compile worked. It will take a while to recompile. 
I"ll let you know how it goes tomorrow.

Andrew
At this pin 

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