安装RVM时出现配置错误

我在安装RVM时遇到错误,我已经安装了带有brew的Ruby 2.0.0,现在我正试图在 http://www.rvm.io

Error running './configure --prefix=/Users/name/.rvm/rubies/ruby-2.0.0-p0 --with-opt-dir=/usr/local/opt/libyaml:/usr/local/opt/readline:/usr/local/opt/libxml2:/usr/local/opt/libxslt:/usr/local/opt/libksba:/usr/local/opt/openssl:/usr/local/opt/sqlite --disable-install-doc --without-tcl --without-tk --enable-shared',
please read /Users/name/.rvm/log/ruby-2.0.0-p0/configure.log
There has been an error while running configure. Halting the installation.

这就是我的日志

[2013-04-10 21:50:21] ./configure
configure: WARNING: unrecognized options: --without-tcl, --without-tk
checking build system type... i386-apple-darwin12.3.0
checking host system type... i386-apple-darwin12.3.0
checking target system type... i386-apple-darwin12.3.0
checking for gcc-4.2... no
checking for clang... no
checking for gcc... no
checking for cc... no
checking for gcc... no
checking for cc... no
checking for cl.exe... no
configure: error: in `/Users/name/.rvm/src/ruby-2.0.0-p0':
configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details

我也安装了Xcode。