>From the log:

duplicate symbol '_compress' in:
    obj/src/.libs/dteval.o
    /usr/local/lib/libz.a(compress.o)
ld: 1 duplicate symbol for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)



I'd suggest to check where this version of /usr/local/lib/libz.a comes 
from. 
Homebrew normally installs zlib keg-only, i.e., in /usr/local/opt/zlib/, 
not there.
Try removing it and/or reinstalling homebrew's zlib.


On Thursday, June 4, 2020 at 7:29:33 PM UTC-7, Aaron Lauve wrote:
>
> It's been awhile since I built sage from source. (I think I was running 
> 8.5?)
> In the meantime, I migrated files from one laptop to another, and upgraded 
> operating systems, so not sure where the problem lies.
>
> Running macOS 10.15.3 on a 2019 Airbook.
>
> I tried the following:
>
> git branch master
> git pull
> make distclean && make
>
> ************************************************************************
>
> Error installing package gap-4.10.2.p1
>
> ************************************************************************
>
> Please email sage-devel (http://groups.google.com/group/sage-devel)
>
> Fwiw, I first tried installing gcc with homebrew before getting started 
> with the sage build.
> When I first got the error, I uninstalled hoping that would fix things, 
> but still no good.
>
> Thanks for any help you can offer!
>
> Aaron
>

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