According to your kiwisolver-1.4.5 log, 

[spkg-install] py/src/constraint.cpp:8:10: fatal error: 'algorithm' file 
not found [spkg-install] 8 | #include <algorithm> [spkg-install] | 
^~~~~~~~~~~ [spkg-install] 1 error generated. [spkg-install] error: command 
'/usr/bin/gcc' failed with exit code 1

your gcc at 
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
 
is not used by Sage.

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