the interesting part of the log is

                           * The following required packages can not be built:
                            * png
                            * Try installing png with `brew install libpng` and
                            * pkg-config with `brew install pkg-config`

It seems you are building under Homebrew, but something goes wrong with libpng.
Do you have it installed?

Do you have Sage's libpng built?




On Tue, Jan 21, 2020 at 8:01 PM Jeremy Martin <jeremy.l.mar...@gmail.com> wrote:
>
> I'm trying to build Sage 9.0 from source under MacOS Mojave 10.14.6. I ran 
> into an error with matplotlib.  The end of the error message is below, and 
> I'm attaching the logfile.
>
> Error building Sage.
>
> The following package(s) may have failed to build (not necessarily
> during this run of 'make all-start'):
>
> * package: matplotlib-2.2.4.p0
>   log file: /Applications/sage-9.0/logs/pkgs/matplotlib-2.2.4.p0.log
>   build directory: 
> /Applications/sage-9.0/local/var/tmp/sage/build/matplotlib-2.2.4.p0
>
> Any advice you can give will be helpful.  Thanks!
>
> --Jeremy Martin
>
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