warning insecure world writable dir ruby mode 040777，gem insstal sass error failed to build gem native extension

//1.删除原gem源
gem sources --remove https://rubygems.org/

//2.添加国内镜像
gem source -a https://gems.ruby-china.com

//3.打印是否替换成功
gem sources -l

//4.更换成功后打印如下
*** CURRENT SOURCES ***
 https://gems.ruby-china.com

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

    current directory: /var/lib/gems/2.5./gems/ffi-1.11./ext/ffi_c
/usr/bin/ruby2. -r ./siteconf20190522--9c6o4.rb extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h

extconf failed, exit code 

Gem files will remain installed in /var/lib/gems/2.5./gems/ffi-1.11. for inspection.
Results logged to /var/lib/gems/2.5./extensions/x86_64-linux/2.5./ffi-1.11./gem_make.out

这个烂方法不能用

sudo chmod 777 /Library/Ruby/Gems

sudo chmod go-w /usr/local/bin

来安装一个homebrew

https://docs.brew.sh/Homebrew-on-Linux

sh -c "$(curl -fsSL https://raw.githubusercontent.com/Linuxbrew/install/master/install.sh)"

继续按照官方说的做，基本上都是环境的问题。

test -d ~/.linuxbrew && eval $(~/.linuxbrew/bin/brew shellenv)
test -d /home/linuxbrew/.linuxbrew && eval $(/home/linuxbrew/.linuxbrew/bin/brew shellenv)
test -r ~/.bash_profile && echo "eval \$($(brew --prefix)/bin/brew shellenv)" >>~/.bash_profile
echo "eval \$($(brew --prefix)/bin/brew shellenv)" >>~/.profile

安装完毕测试一下

brew install hello

安装了完整版居然好了。。。。好吧

sudo apt-get install ruby-full

如果没好，那就继续

brew install ruby

不知道homebrew的不要问我，因为我也不知道是什么鬼。应该和忍者影分身一种鬼东西。

安装完毕看一下版本号

继续安装sass(我叫他洒洒水)

安装成功，查看一下是否安装成功

landv@Desktop201712556489:~/node$ sass -v
bash: sass: 未找到命令
landv@Desktop201712556489:~/node$ 

悲惨呀，又是环境问题，明明已经安装成功了

换一条路

npm install -g sass

一样的问题，找不到命令

FUCK～～～～

难道只有Deepin是酱紫～～～

好吧曲线救国，直接吧npm下载到的node-sass加入环境变量

综上所述，那就是卸载ruby再进行安装配置，如果还不行那就再卸载一边。

ERROR:  While executing gem ... (Errno::EACCES)
Permission denied @ rb_sysopen - /Library/Ruby/Gems/2.3./gems/fuzzy_match-2.1./.gitignore

报这个错误就执行

sudo gem install cocoapods-core

然后再安装sass

记住千万不要用deepin自带的ruby

重要的事情不怕多说

sudo apt-get install ruby-full

Linux用流了，要比Windows配置快。

Deepin Linux 绝逼是环境的问题，虽然它不背锅吧。

https://www.cnblogs.com/landv/p/10867433.html（深度Linux /etc/profile 环境变量生效问题）