..........

Installing libxml-ruby (2.7.0) 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

    /home/ubuntu/.rvm/rubies/ruby-1.8.7-p374/bin/ruby extconf.rb 
checking for socket() in -lsocket... no
checking for gethostbyname() in -lnsl... yes
checking for atan() in -lm... no
checking for atan() in -lm... yes
checking for inflate() in -lz... yes
checking for iconv_open() in -liconv... no
checking for libiconv_open() in -liconv... no
checking for libiconv_open() in -llibiconv... no
checking for iconv_open() in -llibiconv... no
checking for iconv_open() in -lc... yes
checking for xmlParseDoc() in -lxml2... no
checking for xmlParseDoc() in -llibxml2... no
checking for xmlParseDoc() in -lxml2... 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
    --without-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=/home/ubuntu/.rvm/rubies/ruby-1.8.7-p374/bin/ruby
    --with-iconv-dir
    --without-iconv-dir
    --with-iconv-include
    --without-iconv-include=${iconv-dir}/include
    --with-iconv-lib
    --without-iconv-lib=${iconv-dir}/lib
    --with-zlib-dir
    --without-zlib-dir
    --with-zlib-include
    --without-zlib-include=${zlib-dir}/include
    --with-zlib-lib
    --without-zlib-lib=${zlib-dir}/lib
    --with-socketlib
    --without-socketlib
    --with-nsllib
    --without-nsllib
    --with-mlib
    --without-mlib
    --with-mlib
    --without-mlib
    --with-zlib
    --without-zlib
    --with-iconvlib
    --without-iconvlib
    --with-iconvlib
    --without-iconvlib
    --with-libiconvlib
    --without-libiconvlib
    --with-libiconvlib
    --without-libiconvlib
    --with-clib
    --without-clib
    --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
    --with-xml2lib
    --without-xml2lib
    --with-libxml2lib
    --without-libxml2lib
    --with-xml2lib
    --without-xml2lib
 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



Gem files will remain installed in /home/ubuntu/.rvm/gems/ruby-1.8.7-p374@ieasy/gems/libxml-ruby-2.7.0 for inspection.
Results logged to /home/ubuntu/.rvm/gems/ruby-1.8.7-p374@ieasy/gems/libxml-ruby-2.7.0/ext/libxml/gem_make.out

An error occurred while installing libxml-ruby (2.7.0),and Bundler cannot continue.
Make sure that `gem install libxml-ruby -v '2.7.0'` succeeds before bundling.

不确定这里有什么问题.这是在我的另一个盒子上使用相同的ruby和rails版本.

一直试图弄清楚但没有运气.

请帮忙. ：( .. 谢谢！