gem install rails -v '4.2.4' failed to compile - ruby-on-rails

Question

Building native extensions. This could take a while...
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.
current directory: /home/nagaraju/.rvm/gems/ruby-2.2.4#maxmywealth/gems/nokogiri-1.6.7.2/ext/nokogiri
/home/nagaraju/.rvm/rubies/ruby-2.2.4/bin/ruby -r ./siteconf20160226-5567-umlwr8.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/nagaraju/.rvm/rubies/ruby-2.2.4/bin/$(RUBY_BASE_NAME)
--help
--clean
/home/nagaraju/.rvm/rubies/ruby-2.2.4/lib/ruby/2.2.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /home/nagaraju/.rvm/rubies/ruby-2.2.4/lib/ruby/2.2.0/mkmf.rb:571:in `block in try_compile'
from /home/nagaraju/.rvm/rubies/ruby-2.2.4/lib/ruby/2.2.0/mkmf.rb:522:in `with_werror'
from /home/nagaraju/.rvm/rubies/ruby-2.2.4/lib/ruby/2.2.0/mkmf.rb:571:in `try_compile'
from extconf.rb:80:in `nokogiri_try_compile'
from extconf.rb:87:in `block in add_cflags'
from /home/nagaraju/.rvm/rubies/ruby-2.2.4/lib/ruby/2.2.0/mkmf.rb:619:in `with_cflags'
from extconf.rb:86:in `add_cflags'
from extconf.rb:336:in `<main>'
To see why this extension failed to compile, please check the mkmf.log which can be found here:
/home/nagaraju/.rvm/gems/ruby-2.2.4#maxmywealth/extensions/x86_64-linux/2.2.0/nokogiri-1.6.7.2/mkmf.log
extconf failed, exit code 1
Gem files will remain installed in /home/nagaraju/.rvm/gems/ruby-2.2.4#maxmywealth/gems/nokogiri-1.6.7.2 for inspection.
Results logged to /home/nagaraju/.rvm/gems/ruby-2.2.4#maxmywealth/extensions/x86_64-linux/2.2.0/nokogiri-1.6.7.2/gem_make.out

Answer 1

As mentioned in the comments, you have to install developer tools first. Which is a simple command in the terminal:
xcode-select --install
After the installation is complete. Try installing rails.
Let us know, otherwise.