安装Ruby rvm的问题（运行configure时出错）

ruby-1.9.3-p0 - #configuring 
*ERROR: Error running ' ./configure --prefix=/Users/davedelich/.rvm/rubies/ruby-1.9.3-p0 --enable-shared --disable-install-doc --with-libyaml-dir=/Users/davedelich/.rvm/usr ', please read /Users/davedelich/.rvm/log/ruby-1.9.3-p0/configure.log
ERROR: There has been an error while running configure. Halting the installation.*

SupremeOverlord:~ davedelich$ cat /Users/davedelich/.rvm/log/ruby-1.9.3-p0/configure.log
[2011-12-03 22:09:03]  ./configure --prefix=/Users/davedelich/.rvm/rubies/ruby-1.9.3-p0 --
enable-shared --disable-install-doc --with-libyaml-dir=/Users/davedelich/.rvm/usr 
configure: WARNING: unrecognized options: --with-libyaml-dir
checking build system type... x86_64-apple-darwin11.2.0
checking host system type... x86_64-apple-darwin11.2.0
checking target system type... x86_64-apple-darwin11.2.0
checking whether the C compiler works... no
configure: error: in `/Users/davedelich/.rvm/src/ruby-1.9.3-p0':
configure: error: C compiler cannot create executables
See `config.log' for more details
ruby-1.9.3-p0 - #configuring 
*ERROR: Error run