从rvm更新ruby 1.9.3时出现configure.log问题

我已经安装了最新的Xcode，但这种情况一直在发生。我怎样才能解决这个问题

Fetching yaml-0.1.4.tar.gz to /Users/dmonkeys/.rvm/archives
Extracting yaml-0.1.4.tar.gz to /Users/dmonkeys/.rvm/src
Error running 'tar xmzf /Users/dmonkeys/.rvm/archives/yaml-0.1.4.tar.gz -C /Users/dmonkeys/.rvm/src ', please read /Users/dmonkeys/.rvm/log/ruby-1.9.3-p194/yaml/extract.log
Configuring yaml in /Users/dmonkeys/.rvm/src/yaml-0.1.4.
Error running ' ./configure --prefix="/Users/dmonkeys/.rvm/usr"  ', please read /Users/dmonkeys/.rvm/log/ruby-1.9.3-p194/yaml/configure.log
Compiling yaml in /Users/dmonkeys/.rvm/src/yaml-0.1.4.
Error running 'make ', please read /Users/dmonkeys/.rvm/log/ruby-1.9.3-p194/yaml/make.log


Database file /Users/dmonkeys/.rvm/config/packages does not exist.

Installing Ruby from source to: /Users/dmonkeys/.rvm/rubies/ruby-1.9.3-p194, this may take a while depending on your cpu(s)...

ruby-1.9.3-p194 - #fetching 
ruby-1.9.3-p194 - #extracted to /Users/dmonkeys/.rvm/src/ruby-1.9.3-p194 (already extracted)
ruby-1.9.3-p194 - #configuring 
Error running ' ./configure --prefix=/Users/dmonkeys/.rvm/rubies/ruby-1.9.3-p194 --enable-shared --disable-install-doc --with-libyaml --with-opt-dir=/Users/dmonkeys/.rvm/usr ', please read /Users/dmonkeys/.rvm/log/ruby-1.9.3-p194/configure.log
There has been an error while running configure. Halting the installation.
ls: /Users/dmonkeys/.rvm/rubies/*/bin/ruby: No such file or directory

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它看起来缺少开发工具，请阅读（并按照说明）的输出：

最重要的是，您需要

make

您可以通过osx gcc安装程序获得它

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对于新安装，一个选项也是

what does/Users/dmonkeys/.rvm/log/ruby-1.9.3-p194/yaml/make.log say？它说[2012-06-13 21:28:10]make-j2/Users/dmonkeys/.rvm/scripts/functions/utility:第147行：make:command not found

rvm requirements