Hello colin as u told me to send some data relavant to your command let me 
give a Result of command that i tried

prasanna@prasanna-HP-Pavilion-dv6-Notebook-PC:~$ gem -v
2.4.8

prasanna@prasanna-HP-Pavilion-dv6-Notebook-PC:~$ which gem
/home/prasanna/.rvm/rubies/ruby-2.2.3/bin/gem

prasanna@prasanna-HP-Pavilion-dv6-Notebook-PC:~$ apt-cache policy libxml2
libxml2:
  Installed: 2.9.1+dfsg1-3ubuntu4.4
  Candidate: 2.9.1+dfsg1-3ubuntu4.4
  Version table:
 *** 2.9.1+dfsg1-3ubuntu4.4 0
        500 http://in.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 
Packages
        500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 
Packages
        100 /var/lib/dpkg/status
     2.9.1+dfsg1-3ubuntu4 0
        500 http://in.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

This is what  all i got ..
On Monday, September 14, 2015 at 3:34:22 PM UTC+5:30, Prasanna Moharana 
wrote:
>
>
> <https://lh3.googleusercontent.com/-k2GxhXioxdY/VfaavXNSucI/AAAAAAAAARc/0ECId5N62jU/s1600/Screenshot%2Bfrom%2B2015-09-14%2B12%253A55%253A28.png>
> Hello every body am very new to this group.
> i have some issue regarding Rails installation.Though i have installed 
> Ruby,bundler etc i was trying to install rails using gem install rails 
> command but there are some error like 
>
> ERROR:  Error installing rails:
>     ERROR: Failed to build gem native extension.
>
>     /home/prasanna/.rvm/rubies/ruby-2.2.3/bin/ruby -r 
> ./siteconf20150914-3856-mtv6bq.rb extconf.rb
> checking if the C compiler accepts ... *** 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/prasanna/.rvm/rubies/ruby-2.2.3/bin/$(RUBY_BASE_NAME)
>     --help
>     --clean
>
>
> so can any body please help me to tackle this..
>
> PS.Tried -sudo apt-get install mkmf ,
> gem install mkmf
> build essential command etc..so please help me to get rid of these..
>
>

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