我是 Ruby 世界的新手，我需要克隆一个现有项目。
说明是：
source .env.development
bundle install
但它失败了：
Using libv8 3.16.14.15
Fetching libxml-ruby 2.9.0
Installing libxml-ruby 2.9.0 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
current directory: /Users/vlad/.rvm/gems/ruby-2.3.1/gems/libxml-ruby-2.9.0/ext/libxml
/Users/vlad/.rvm/rubies/ruby-2.3.1/bin/ruby -r ./siteconf20181109-46682-fvgifh.rb extconf.rb --use-system-libraries
checking for libxml/xmlversion.h in /opt/include/libxml2,/opt/local/include/libxml2,/usr/local/include/libxml2,/usr/include/libxml2... no
*** 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/vlad/.rvm/rubies/ruby-2.3.1/bin/$(RUBY_BASE_NAME)
--with-xml2-config
--without-xml2-config
--with-xml2-dir
--without-xml2-dir
--with-xml2-include
--without-xml2-include=${xml2-dir}/include
--with-xml2-lib
--without-xml2-lib=${xml2-dir}/lib
extconf failure: need libxml2.
Install the library or try one of the following options to extconf.rb:
--with-xml2-config=/path/to/xml2-config
--with-xml2-dir=/path/to/libxml2
--with-xml2-lib=/path/to/libxml2/lib
--with-xml2-include=/path/to/libxml2/include
To see why this extension failed to compile, please check the mkmf.log which can be found here:
/Users/vlad/.rvm/gems/ruby-2.3.1/extensions/x86_64-darwin-18/2.3.0/libxml-ruby-2.9.0/mkmf.log
extconf failed, exit code 1
Gem files will remain installed in /Users/vlad/.rvm/gems/ruby-2.3.1/gems/libxml-ruby-2.9.0 for inspection.
Results logged to /Users/vlad/.rvm/gems/ruby-2.3.1/extensions/x86_64-darwin-18/2.3.0/libxml-ruby-2.9.0/gem_make.out
An error occurred while installing libxml-ruby (2.9.0), and Bundler cannot continue.
Make sure that `gem install libxml-ruby -v '2.9.0'` succeeds before bundling.
In Gemfile:
upnxt_community_lib_common was resolved to 1.7.49, which depends on
upnxt_processing_lib_document was resolved to 2.0.0, which depends on
libxml-
如果我想执行建议的命令“gem install libxml-ruby -v '2.9.0'”，我会得到同样的错误。
操作系统：MacOS Mojave，版本 10.14。
项目所需的Ruby版本：ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin18]
我也尝试过this https://stackoverflow.com/a/23550421/3018671但这没有帮助。
预先感谢您的任何帮助！
这些步骤对我有用（source https://github.com/twilio/twilio-ruby/issues/315#issuecomment-493283073)
brew install libxml2
bundle config --global build.libxml-ruby --with-xml2-config="$(brew --prefix libxml2)/bin/xml2-config"
then bundle install按预期工作
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