ruby-on-rails - 安装 rails 时出错，无法构建 gem native 扩展

Question

我正在关注 this Go Rails tutorial当我到达安装 rails 的步骤时遇到了麻烦。我在打电话

sudo gem install rails -v 5.0.1

在终端中出现此错误:

ERROR:  Error installing rails:
    ERROR: Failed to build gem native extension.

    current directory: /usr/local/lib/ruby/gems/2.4.0/gems/nokogiri-1.7.0.1/ext/nokogiri
/usr/local/opt/ruby/bin/ruby -r ./siteconf20170302-50105-1af2foa.rb extconf.rb
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 packaged libraries.
Using mini_portile version 2.1.0
checking for iconv.h... yes
checking for gzdopen() in -lz... no
zlib is missing; necessary for building libxml2
*** 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=/usr/local/Cellar/ruby/2.4.0/bin/$(RUBY_BASE_NAME)
    --help
    --clean
    --use-system-libraries
    --enable-static
    --disable-static
    --with-zlib-dir
    --without-zlib-dir
    --with-zlib-include
    --without-zlib-include=${zlib-dir}/include
    --with-zlib-lib
    --without-zlib-lib=${zlib-dir}/lib
    --enable-cross-build
    --disable-cross-build

To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /usr/local/lib/ruby/gems/2.4.0/extensions/x86_64-darwin-16/2.4.0/nokogiri-1.7.0.1/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /usr/local/lib/ruby/gems/2.4.0/gems/nokogiri-1.7.0.1 for inspection.
Results logged to /usr/local/lib/ruby/gems/2.4.0/extensions/x86_64-darwin-16/2.4.0/nokogiri-1.7.0.1/gem_make.out

我真的不知道该怎么做。我试过重新安装卸载和重新安装 zlib 但它似乎没有改变任何东西。顺便说一下，我使用的是 OS X Sierra 10.12.3 版。

Answer 1

由 this thread 解决使用

sudo gem install rails -- --use-system-libraries --with-xml=/usr/local/Cellar/libxml2/