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当我尝试使用sudo gem install compass它安装指南针时，请告诉我：

    Building native extensions.  This could take a while...
ERROR:  Error installing compass:
    ERROR: Failed to build gem native extension.

    /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby -r ./siteconf20141125-86718-gjziv3-0.rb extconf.rb
checking for ffi.h... no
checking for ffi.h in /usr/local/include,/usr/include/ffi... no
checking for rb_thread_blocking_region()... no
checking for rb_thread_call_with_gvl()... no
checking for rb_thread_call_without_gvl()... no
checking for ffi_prep_cif_var()... no
creating extconf.h
creating Makefile

make  clean

make
mkdir -p "/Library/Ruby/Gems/1.8/gems/ffi-1.9.6/ext/ffi_c"/libffi-i386; (if [ ! -f "/Library/Ruby/Gems/1.8/gems/ffi-1.9.6/ext/ffi_c"/libffi-i386/Makefile ]; then echo "Configuring libffi for i386"; cd "/Library/Ruby/Gems/1.8/gems/ffi-1.9.6/ext/ffi_c"/libffi-i386 && env CC=" xcrun cc" CFLAGS="-arch i386 " LDFLAGS="-arch i386" "/Library/Ruby/Gems/1.8/gems/ffi-1.9.6/ext/ffi_c/libffi"/configure --disable-static --with-pic=yes --disable-dependency-tracking --host=i386-apple-darwin > /dev/null; fi); env MACOSX_DEPLOYMENT_TARGET=10.4 make -C "/Library/Ruby/Gems/1.8/gems/ffi-1.9.6/ext/ffi_c"/libffi-i386
Configuring libffi for i386
configure: WARNING: if you wanted to set the --build type, don't use --host.
    If a cross compiler is detected then cross compile mode will be used
configure: error: in `/Library/Ruby/Gems/1.8/gems/ffi-1.9.6/ext/ffi_c/libffi-i386':
configure: error: C compiler cannot create executables
See `config.log' for more details
make[1]: *** No targets specified and no makefile found.  Stop.
make: *** ["/Library/Ruby/Gems/1.8/gems/ffi-1.9.6/ext/ffi_c"/libffi-i386/.libs/libffi_convenience.a] Error 2

make failed, exit code 2

Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/ffi-1.9.6 for inspection.
Results logged to /Library/Ruby/Gems/1.8/extensions/universal-darwin-11/1.8/ffi-1.9.6/gem_make.out

我已经正确安装了 sass 和 xcode 工具，但没有任何改变。我什至尝试升级红宝石。我应该怎么办？

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1 回答 1

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发生这种情况是因为您想要 sudo install 并且可能未将环境变量配置为使用您安装的 ruby​​，而是使用可能不是您想要使用的系统 ruby​​。

在 Mac 上使用 Ruby 最简单的方法是使用自制软件安装 rbenv 和 ruby​​-build。

要安装 homebrew，只需运行可以在brew 主页上找到的命令： 

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

要安装 rbenv 和 ruby​​-build，你可以运行这些可以在Github上找到的命令：

brew update
brew install rbenv ruby-build

忘记添加了，那么你需要使用 rbenv 安装一个 ruby​​ 版本并使其全局化。

rbenv install 2.1.5
rbenv global 2.1.5

最后：

gem install compass

只需确保 gem 二进制文件指向您安装的版本即可。
您可以运行gem env并检查打印的路径，如果它不指向新安装的 ruby​​ gem 路径，请关闭终端并打开一个新的，然后安装 gem。

这是我机器上打印的前几行：

RubyGems Environment:
  - RUBYGEMS VERSION: 2.2.0
  - RUBY VERSION: 2.1.0 (2013-12-25 patchlevel 0) [x86_64-darwin13.0]
  - INSTALLATION DIRECTORY: /Users/jani/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0
  ....
于 2014-11-25T19:29:42.777 回答