如何在新的Mountain Lion安装上安装libv8 ruby​​ gem？

Question

我一直在讨厌这个问题.我在几个相关的帖子中都遵循了建议,但无济于事.

我从一个全新的Mountain Lion安装开始,安装了命令行工具,并根据我发现通过Homebrew安装gcc-4.2并在/ usr /中添加符号链接的其他一些帖子成功安装了Ruby 1.8.7斌/ GCC-4.2.

但是,现在我无法成功安装libv8.以下错误是我已经从现有建议中得到的.

任何额外的输入？

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /Users/Eric/.rbenv/versions/1.8.7-p352/bin/ruby extconf.rb 
creating Makefile
Unable to find a compiler officially supported by v8.
It is recommended to use GCC v4.4 or higher
Traceback (most recent call last):
  File "build/gyp/gyp", line 18, in <module>
    sys.exit(gyp.main(sys.argv[1:]))
  File "build/gyp/pylib/gyp/__init__.py", line 480, in main
    generator.GenerateOutput(flat_list, targets, data, params)
  File "build/gyp/pylib/gyp/generator/make.py", line 2085, in GenerateOutput
    part_of_all=qualified_target in needed_targets)
  File "build/gyp/pylib/gyp/generator/make.py", line 756, in Write
    self.xcode_settings, self.Absolutify, self.Pchify))
  File "build/gyp/pylib/gyp/generator/make.py", line 1132, in WriteSources
    cflags = self.xcode_settings.GetCflags(configname)
  File "build/gyp/pylib/gyp/xcode_emulation.py", line 258, in GetCflags
    sdk_root = self._SdkPath()
  File "build/gyp/pylib/gyp/xcode_emulation.py", line 247, in _SdkPath
    return os.path.join(self._GetSdkBaseDir(), '%s.sdk' % sdk_root)
  File "build/gyp/pylib/gyp/xcode_emulation.py", line 233, in _GetSdkBaseDir
    raise Exception('Error %d running xcode-select' % job.returncode)
Exception: Error 2 running xcode-select
make: *** [out/Makefile.x64] Error 1
Using compiler: g++
GYP_GENERATORS=make \
    build/gyp/gyp --generator-output="out" build/all.gyp \
                  -Ibuild/standalone.gypi --depth=. \
                  -Dv8_target_arch=x64 \
                  -S.x64 -Dhost_arch=x64
xcode-select: Error: No Xcode is selected. Use xcode-select -switch <path-to-xcode>, or see the xcode-select manpage (man xcode-select) for further information.



Gem files will remain installed in /Users/Eric/Development/par8o/vendor/bundle/ruby/1.8/gems/libv8-3.11.8.3 for inspection.
Results logged to /Users/Eric/Development/par8o/vendor/bundle/ruby/1.8/gems/libv8-3.11.8.3/ext/libv8/gem_make.out
An error occured while installing libv8 (3.11.8.3), and Bundler cannot continue.
Make sure that `gem install libv8 -v '3.11.8.3'` succeeds before bundling.

Answer 1

这笔交易是红宝石1.8.7.可能你需要这个宝石来运行therubyracer.要完成这项工作,您需要安装therubyracer gem如下:

RUBYOPT=-rrubygems gem install therubyracer

这将安装therubyracer和libv8宝石.

来源:http://coderwall.com/p/y1djxq

Answer 2

不同的 gem 需要不同版本的 GCC，因此这可能适用于所有 gem，也可能不适用于所有 gem，但这些符号链接解决了安装了 Xcode 4.4 的 Mountain Lion 上的 json、eventmachine 和 libv8 gem 的问题。

sudo ln -s /usr/llvm-gcc-4.2/bin/llvm-gcc-4.2 /usr/bin/gcc-4.2

sudo ln -s /usr/llvm-gcc-4.2/bin/llvm-gcc-4.2 /usr/bin/g++-4.2