如果我输入 xcodebuild -version ，它会识别我安装了xcode：
Xcode 4.3.2
Build version 4E2002
但是当我尝试检查 rvm要求时，我得到以下内容：
Notes for Mac OS X 10.7.3, No Xcode.
For JRuby: Install the JDK. See http://developer.apple.com/java/download/ # Current Java version "1.6.0_26"
For IronRuby: Install Mono >= 2.6
For Ruby 1.9.3: Install libksba # If using Homebrew, 'brew install libksba'
You can use & download osx-gcc-installer: https://github.com/kennethreitz/osx-gcc- installer
** NOTE: Currently, Node.js is having issues building with osx-gcc-installer. The only fix is to install Xcode over osx-gcc-installer.
We had reports of http://hpc.sourceforge.net/ making things work, but it looks like not easiest/safest to setup.
To use an RVM installed Ruby as default, instead of the system ruby:
rvm install 1.8.7 # installs patch 357: closest supported version
rvm system ; rvm gemset export system.gems ; rvm 1.8.7 ; rvm gemset import system.gems # migrate your gems
rvm alias create default 1.8.7
And reopen your terminal windows.
Xcode 4.2:
* is only supported by ruby 1.9.3+ using command line flag: --with-gcc=clang
* it breaks gems with native extensions, especially DB drivers.
似乎它没有识别我的xcode，当我尝试安装rvm 1.9.3 时，我得到了：
Fetching yaml-0.1.4.tar.gz to /Users/sikandarshukla/.rvm/archives
Extracting yaml-0.1.4.tar.gz to /Users/sikandarshukla/.rvm/src
Configuring yaml in /Users/sikandarshukla/.rvm/src/yaml-0.1.4.
Error running ' ./configure --prefix="/Users/sikandarshukla/.rvm/usr" ', please read /Users/sikandarshukla/.rvm/log/ruby-1.9.3-p125/yaml/configure.log
Compiling yaml in /Users/sikandarshukla/.rvm/src/yaml-0.1.4.
Error running 'make ', please read /Users/sikandarshukla/.rvm/log/ruby-1.9.3- p125/yaml/make.log
Database file /Users/sikandarshukla/.rvm/config/packages does not exist.
/Users/sikandarshukla/.rvm/scripts/functions/build: line 28: --version: command not found
Installing Ruby from source to: /Users/sikandarshukla/.rvm/rubies/ruby-1.9.3-p125, this may take a while depending on your cpu(s)...
ruby-1.9.3-p125 - #fetching
ruby-1.9.3-p125 - #extracted to /Users/sikandarshukla/.rvm/src/ruby-1.9.3-p125 (already extracted)
ruby-1.9.3-p125 - #configuring
Error running ' ./configure --prefix=/Users/sikandarshukla/.rvm/rubies/ruby-1.9.3-p125 -- enable-shared --disable-install-doc --with-libyaml --with-opt- dir=/Users/sikandarshukla/.rvm/usr ', please read /Users/sikandarshukla/.rvm/log/ruby-1.9.3- p125/configure.log
There has been an error while running configure. Halting the installation.
现在，如果我阅读日志， cat /Users/sikandarshukla/.rvm/log/ruby-1.9.3-p125/configure.log 的输出如下：
./configure --prefix=/Users/sikandarshukla/.rvm/rubies/ruby-1.9.3-p125 --enable-shared -- disable-install-doc --with-libyaml --with-opt-dir=/Users/sikandarshukla/.rvm/usr
configure: WARNING: unrecognized options: --with-libyaml
checking build system type... i386-apple-darwin11.3.0
checking host system type... i386-apple-darwin11.3.0
checking target system type... i386-apple-darwin11.3.0
checking whether the C compiler works... no
configure: error: in `/Users/sikandarshukla/.rvm/src/ruby-1.9.3-p125':
configure: error: C compiler cannot create executables
See `config.log' for more details
以及 cat /Users/sikandarshukla/.rvm/log/ruby-1.9.3-p125/yaml/configure.log 的输出如下：
./configure --prefix="/Users/sikandarshukla/.rvm/usr"
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... config/install-sh -c -d
checking for gawk... no
checking for mawk... no
checking for nawk... no
checking for awk... awk
checking whether make sets $(MAKE)... no
checking for gcc... no
checking for cc... no
checking for cl.exe... no
configure: error: in `/Users/sikandarshukla/.rvm/src/yaml-0.1.4':
configure: error: no acceptable C compiler found in $PATH
See `config.log' for more details
任何想法该怎么做，谢谢你的帮助
答案 0 :(得分：2)
这是识别Xcode版本的一个错误，我创建了一张票，它应该很快就会解决 - ＆gt; https://github.com/wayneeseguin/rvm/issues/846
所有Xcode 4.2+都有同样的问题：
4.2：
只有ruby 1.9.3+使用命令行标志支持
- ： - with-gcc = clang
- 它打破了原生扩展的宝石，尤其是数据库驱动程序。
要解决使用osx-gcc-installer：
你可以使用＆amp;下载osx-gcc-installer：https://github.com/kennethreitz/osx-gcc-installer