error: invalid argument '-std=c++11' not allowed with 'C/ObjC' error: command 'gcc' failed with exit status 1

[parlance]

error: invalid argument '-std=c++11' not allowed with 'C/ObjC' error: command 'gcc' failed with exit status 1

[Romainpaulus]

You're probably using a wrong version of gcc. This command fixed the issue for me on Mac:
CC=/usr/local/bin/gcc-5 CXX=/usr/local/bin/g++-5 python setup.py install

[ryanleary]

Indeed. Feel free to leave another comment if the above doesn't solve your issue.

[davideuler]

On mac m1 with Big Sur:

CC=$(which gcc-11) CXX=$(which g++-11) python setup.py install