無法安裝傑基爾與創業板安裝

Question

我試圖用命令我的Mac上安裝傑奇：

sudo gem install jekyll 

但是我得到的錯誤：

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

    /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/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. 

/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/mkmf.rb:434:in `try_do': The compiler failed to generate an executable file. (RuntimeError) 
You have to install development tools first. 

我在做什麼錯在這裏？

Answer 1

的關鍵信息有：

You have to install development tools first. 

在https://stackoverflow.com/a/9353468/500526