无法设置ruby环境 - 安装fii gem错误

Question

我正在尝试为ruby项目设置environtment。 但是当我运行'bundle'时，我在安装'fii'gem时遇到错误：

    Installing ffi (1.8.1) 
    Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /Users/bmalets/.rvm/rubies/ruby-1.9.3-p448/bin/ruby extconf.rb 
    checking for ffi.h... *** extconf.rb failed ***
    Could not create Makefile due to some reason, probably lack of
    necessary libraries and/or headers.  Check the mkmf.log file for more
    details.  You may need configuration options.

    /Users/bmalets/.rvm/rubies/ruby-1.9.3-p448/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
    You have to install development tools first.

    Gem files will remain installed in /Users/bmalets/.rvm/gems/ruby-1.9.3-p448@api2/gems/ffi-1.8.1 for inspection.
    Results logged to /Users/bmalets/.rvm/gems/ruby-1.9.3-p448@api2/gems/ffi-1.8.1/ext/ffi_c/gem_make.out

    An error occurred while installing ffi (1.8.1), and Bundler cannot continue.
    Make sure that `gem install ffi -v '1.8.1'` succeeds before bundling.

我的环境：

• OS_X 10.8.4

• ruby​​ 1.9.3p448

• Xcode 4.6.3

• libffi-3.0.13

请帮我解决。

Answer 1

确保您已安装Apple Xcode和命令行工具（请参阅此屏幕截图）：

https://developer.apple.com/technologies/tools/

之后，不要忘记安装libffi。

1）如果您使用的是自制

brew install libffi

2）如果您使用的是macport

sudo port install libffi