curl -O https://raw.github.com/pypa/pip/master/contrib/get-pip.py python get-pip.py pip install xml2rfc
yields:
clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future] clang: note: this will be a hard error (cannot be downgraded to a warning) in the future error: command 'cc' failed with exit status 1
So try:
curl -O https://raw.github.com/pypa/pip/master/contrib/get-pip.py python get-pip.py export CFLAGS=-Qunused-arguments export CPPFLAGS=-Qunused-arguments pip install xml2rfc
As partially documented here in Ansible Installation -clang: error: unknown argument: ‘-mno-fused-madd’.