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So this:

sudo gem install -r libxml-ruby

Gives you this:

ERROR:  Error installing libxml-ruby:
ERROR: Failed to build gem native extension.

/usr/bin/ruby1.8 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=/usr/bin/ruby1.8
–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

So, do this:

sudo apt-get install libxml2-dev

And this again:

sudo gem install -r libxml-ruby

Andrew Development Gems, LAMP, Open Source, Rails, Ruby, Ruby on Rails, Ubuntu