Estou tentando agrupar intallunf_ext -v '0.0.6' mas continuo recebendo este erro:

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

checking for main() in -lstdc++... yes
checking for ruby/encoding.h... yes
creating Makefile

make "DESTDIR=" clean

make "DESTDIR="
compiling unf.cc
In file included from unf.cc:1:
In file included from ./unf/normalizer.hh:4:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/vector:265:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/__bit_reference:15:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/algorithm:628:
In file included from /Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/memory:604:
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/iterator:341:10: fatal error: '__debug' file not found
#include <__debug>
         ^
1 error generated.
make: *** [unf.o] Error 1

make failed, exit code 2

Eu corrigem update --system e eu tenhobrew install coreutils mas ainda estou recebendo o mesmo erro.

Atualização: resposta
Transferido e instaladocommandlinetoolsosx10.10forxcode6.2.dmg deDesenvolvedor Apple. Não há necessidade de desinstalar nada.