我正在尝试通过 RVM 将 Ruby 更新到 1.9.3-p327。输入后rvm install 1.9.3-p327，我得到这个：
No binary rubies available for: downloads/ruby-1.9.3-p327.
Continuing with compilation. Please read 'rvm mount' to get more information on binary rubies.
Installing Ruby from source to: /usr/local/rvm/rubies/ruby-1.9.3-p327, this may take a while depending on your cpu(s)...
ruby-1.9.3-p327 - #downloading ruby-1.9.3-p327, this may take a while depending on your connection...
ruby-1.9.3-p327 - #extracted to /usr/local/rvm/src/ruby-1.9.3-p327 (already extracted)
ruby-1.9.3-p327 - #configuring
Error running 'env LDFLAGS=-L/opt/sm/pkg/active/lib CFLAGS=-I/opt/sm/pkg/active/include CPATH=/opt/sm/pkg/active/include ./configure --enable-shared --disable-install-doc --prefix=/usr/local/rvm/rubies/ruby-1.9.3-p327 --with-opt-dir=/usr/local/rvm/usr', please read /usr/local/rvm/log/ruby-1.9.3-p327/configure.log
There has been an error while running configure. Halting the installation.
然后，我检查配置日志，ruby 1.9.3-p327/configure.log在其中看到：
[2012-12-24 22:39:14] env LDFLAGS=-L/opt/sm/pkg/active/lib CFLAGS=- I/opt/sm/pkg/active/include CPATH=/opt/sm/pkg/active/include ./configure --enable-shared --disable-install-doc --prefix=/usr/local/rvm/rubies/ruby-1.9.3-p327 --with-opt-dir=/usr/local/rvm/usr
checking build system type... x86_64-apple-darwin11.4.2
checking host system type... x86_64-apple-darwin11.4.2
checking target system type... x86_64-apple-darwin11.4.2
checking whether the C compiler works... no
configure: error: in `/usr/local/rvm/src/ruby-1.9.3-p327':
configure: error: C compiler cannot create executables
See `config.log' for more details
我已经安装了最新的 Xcode 4.5.2 以及通过 Xcode 安装 CLT.. 似乎 C 编译器不起作用，我不知道如何修复它。有什么建议吗？