我试图在Ruby和RVM下安装Nokogiri 1.6.1,但是失败了,出现以下错误：
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension. /Users/lmo0/.rvm/rubies/ruby-2.0.0-p353/bin/ruby extconf.rb Extracting libxml2-2.8.0.tar.gz into tmp/x86_64-apple-darwin13.0.0/ports/libxml2/2.8.0... OK Running 'configure' for libxml2 2.8.0... OK Running 'compile' for libxml2 2.8.0... OK Running 'install' for libxml2 2.8.0... OK Activating libxml2 2.8.0 (from /Users/lmo0/.rvm/gems/ruby-2.0.0-p353/gems/nokogiri-1.6.1/ports/x86_64-apple-darwin13.0.0/libxml2/2.8.0)... Extracting libxslt-1.1.26.tar.gz into tmp/x86_64-apple-darwin13.0.0/ports/libxslt/1.1.26... OK Running 'configure' for libxslt 1.1.26... ERROR,review 'tmp/x86_64-apple-darwin13.0.0/ports/libxslt/1.1.26/configure.log' to see what happened. *** 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. Provided configuration options: --with-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/Users/lmo0/.rvm/rubies/ruby-2.0.0-p353/bin/ruby /Users/lmo0/.rvm/gems/ruby-2.0.0-p353/gems/mini_portile-0.5.2/lib/mini_portile.rb:265:in `block in execute': Failed to complete configure task (RuntimeError) from /Users/lmo0/.rvm/gems/ruby-2.0.0-p353/gems/mini_portile-0.5.2/lib/mini_portile.rb:257:in `chdir' from /Users/lmo0/.rvm/gems/ruby-2.0.0-p353/gems/mini_portile-0.5.2/lib/mini_portile.rb:257:in `execute' from /Users/lmo0/.rvm/gems/ruby-2.0.0-p353/gems/mini_portile-0.5.2/lib/mini_portile.rb:65:in `configure' from /Users/lmo0/.rvm/gems/ruby-2.0.0-p353/gems/mini_portile-0.5.2/lib/mini_portile.rb:108:in `cook' from extconf.rb:101:in `block in <main>' from extconf.rb:131:in `call' from extconf.rb:131:in `block in <main>' from extconf.rb:122:in `tap' from extconf.rb:122:in `<main>' Gem files will remain installed in /Users/lmo0/.rvm/gems/ruby-2.0.0-p353/gems/nokogiri-1.6.1 for inspection. Results logged to /Users/lmo0/.rvm/gems/ruby-2.0.0-p353/gems/nokogiri-1.6.1/ext/nokogiri/gem_make.out
解决方法
检查您的grep版本并安装最新的brew brew：
$grep --version grep (BSD grep) 2.5.1-FreeBSD $brew install grep --default-names # If above fails,you probably need to tap $brew tap homebrew/dupes $brew install grep --default-names $grep --version grep (GNU grep) 2.14.56-1e3d
来自(这个nokogiri问题)[https://github.com/sparklemotion/nokogiri/issues/935]：
“最新版本的OSX附带了BSD grep,而较旧的版本附带了GNU grep.那么,你的构建脚本可能需要GNU grep”
从Maverick的评论中窃取并在此复制作为答案,而不是评论,因为我现在已经多次遇到这个问题,并且希望能够挽救别人的头痛. = X