無法設置ruby環境 - 安裝fii gem錯誤

Question

我正在嘗試為ruby項目設置環境。 但是當我運行'bundle'時，我在安裝'fii'gem時遇到錯誤：

    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.

我的環境：

• OS_X 10.8.4

• 紅寶石1.9.3p448

• Xcode 4.6.3

• libffi-3.0.13

請幫我修理一下。

Answer 1

確保您已安裝Apple Xcode和命令行工具（請參閱此屏幕截圖）：

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

之后，不要忘記安裝libffi。

1）如果你使用自制軟件

brew install libffi

2）如果你使用macport

sudo port install libffi