ruby 遇到过的问题集锦

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nokogiri 安装问题

ERROR: cannot discover where libxml2 is located on your system. please make sure pkg-config is installed.

报错信息：

current directory: /Users/chenkunhui/.rvm/gems/ruby-2.5.1@toolgems/gems/nokogiri-1.8.4/ext/nokogiri
/Users/chenkunhui/.rvm/rubies/ruby-2.5.1/bin/ruby -r ./siteconf20190327-6771-1hthttu.rb extconf.rb --use-system-libraries
checking if the C compiler accepts ... yes
checking if the C compiler accepts -Wno-error=unused-command-line-argument-hard-error-in-future... no
Building nokogiri using system libraries.
Using pkg-config gem version 1.3.7
checking for libxml-2.0... yes
checking for libxslt... yes
checking for libexslt... yes
ERROR: cannot discover where libxml2 is located on your system. please make sure `pkg-config` is installed.
*** 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.

...

系统已经安装了 pkg-config 和 libxml2, 但却报错说找不到 libxml2,
解决办法是安装 gem 包时，指定 libxml2 的位置。

解决方案：

参考： https://gist.github.com/sobstel/f6a490d854a2e5a214c3f2cd9c366032

执行以下代码:

gem install nokogiri -v '1.8.4' -- --with-xml2-include=/usr/local/Cellar/libxml2/2.9.9_2/include/libxml2 --use-system-libraries`

可以看到一下输出

Building native extensions with: '--with-xml2-include=/usr/local/Cellar/libxml2/2.9.9_2/include/libxml2 --use-system-libraries'
This could take a while...
Successfully installed nokogiri-1.8.4
Parsing documentation for nokogiri-1.8.4
Installing ri documentation for nokogiri-1.8.4
Done installing documentation for nokogiri after 12 seconds
1 gem installed
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