The traces of fortran 9 (and actually gcc 9) are due to .homebrew-build-env. 
which contains: 

for l in "gcc@9/lib/gcc/9"; do
    if [ -d "$HOMEBREW/opt/$l" ]; then
        LIBRARY_PATH="$HOMEBREW/opt/$l:$LIBRARY_PATH"
    fi
done


> Le 9 sept. 2020 à 17:01, Dima Pasechnik <[email protected]> a écrit :
> 
> ok, you have a non-standard arb in your Homebrew install.
> 
> you need to reinstall it, or perhaps better just remove it.
> 
> you also have traces of gfortran 9 in LIBRARY_PATH - investigate and clean...
> 
> On Wed, 9 Sep 2020, 15:57 [email protected] <mailto:[email protected]>, 
> <[email protected] <mailto:[email protected]>> wrote:
> I can try to install ntl and flint, but then I have to remove dependencies as 
> well, right ?
> 
> sapristi:sage dcoudert$ brew uninstall ntl flint
> Error: Refusing to uninstall /usr/local/Cellar/flint/2.6.3
> because it is required by arb, which is currently installed.
> You can override this and force removal with:
>   brew uninstall --ignore-dependencies ntl flint
> 
> 
> Le mercredi 9 septembre 2020 à 16:53:47 UTC+2, [email protected] 
> <mailto:[email protected]> a écrit :
> On Wednesday, September 9, 2020 at 2:49:19 AM UTC-7, [email protected] <> 
> wrote:
> If I understand well, I’m facing the case (not completely sure): 
> homebrew-macos-python3_xcode-gcc_spkg-{minimal,standard}: Various build 
> errors (ignore for Sage 9.2)
> 
> That is: macOS 10.15.6 with clang version 11.0.3 (clang-1103.0.32.62) and all 
> recommended packages installed with homebrew, and unable to compile beta12.
> 
> 
> Actually your configuration is "homebrew-macos-standard" with probably some 
> extra homebrew packages installed. 
> 
> (The configuration factor "gcc_spkg" refers to using gcc 9.2 from our SPKG 
> instead of Xcode "gcc" (clang).)
> 
> My guess is that if you uninstall homebrew's ntl and flint packages and build 
> from scratch (distclean), the build would go through.
> 
> https://trac.sagemath.org/ticket/27764 
> <https://trac.sagemath.org/ticket/27764> and tickets referenced within 
> address the NTL / thread-local storage issues.
> 
> 
> 
> 
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