无法安装杰基尔与创业板安装

Question

我试图用命令我的Mac上安装杰奇：

sudo gem install jekyll 

但是我得到的错误：

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. 

我在做什么错在这里？

Answer 1

的关键信息有：

You have to install development tools first. 

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