Cant install rails - ruby-on-rails

Question

I have a new set up, and I keep getting an error when I am trying to install rails. I have used RVM to use ruby 2.2.2, and I have checked through the config files.
I have followed various tutorials. I have uninstalled gcc ( though i may reinstall xcode )
and I have gone through various tutorials on how to install this
gem install rails [9:00:49]
Building native extensions. This could take a while...
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.
/Users/rrobin008c/.rvm/rubies/ruby-2.2.2/bin/ruby -r ./siteconf20150812-28205-1wdgrip.rb extconf.rb
checking if the C compiler accepts -O2 -arch x86_64... yes
checking if the C compiler accepts -Wno-error=unused-command-line-argument-hard-error-in-future... no
Building nokogiri using packaged libraries.
checking for gzdopen() in -lz... yes
checking for iconv... yes
************************************************************************
IMPORTANT NOTICE:
Building Nokogiri with a packaged version of libxml2-2.9.2
with the following patches applied:
- 0001-Revert-Missing-initialization-for-the-catalog-module.patch
- 0002-Fix-missing-entities-after-CVE-2014-3660-fix.patch
Team Nokogiri will keep on doing their best to provide security
updates in a timely manner, but if this is a concern for you and want
to use the system library instead; abort this installation process and
reinstall nokogiri as follows:
gem install nokogiri -- --use-system-libraries
[--with-xml2-config=/path/to/xml2-config]
[--with-xslt-config=/path/to/xslt-config]
If you are using Bundler, tell it to use the option:
bundle config build.nokogiri --use-system-libraries
bundle install
Note, however, that nokogiri is not fully compatible with arbitrary
versions of libxml2 provided by OS/package vendors.
************************************************************************
Extracting libxml2-2.9.2.tar.gz into tmp/x86_64-apple-darwin14.4.0/ports/libxml2/2.9.2... OK
Running patch with /Users/rrobin008c/.rvm/gems/ruby-2.2.2/gems/nokogiri-1.6.6.2/ports/patches/libxml2/0001-Revert-Missing-initialization-for-the-catalog-module.patch...
Running 'patch' for libxml2 2.9.2... OK
Running patch with /Users/rrobin008c/.rvm/gems/ruby-2.2.2/gems/nokogiri-1.6.6.2/ports/patches/libxml2/0002-Fix-missing-entities-after-CVE-2014-3660-fix.patch...
Running 'patch' for libxml2 2.9.2... OK
Running 'configure' for libxml2 2.9.2... ERROR, review '/Users/rrobin008c/.rvm/gems/ruby-2.2.2/gems/nokogiri-1.6.6.2/ext/nokogiri/tmp/x86_64-apple-darwin14.4.0/ports/libxml2/2.9.2/configure.log' to see what happened.
*** 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=/Users/rrobin008c/.rvm/rubies/ruby-2.2.2/bin/$(RUBY_BASE_NAME)
--help
--clean
--use-system-libraries
--enable-static
--disable-static
--with-zlib-dir
--without-zlib-dir
--with-zlib-include
--without-zlib-include=${zlib-dir}/include
--with-zlib-lib
--without-zlib-lib=${zlib-dir}/lib
--enable-cross-build
--disable-cross-build
/Users/rrobin008c/.rvm/gems/ruby-2.2.2/gems/mini_portile-0.6.2/lib/mini_portile.rb:279:in `block in execute': Failed to complete configure task (RuntimeError)
from /Users/rrobin008c/.rvm/gems/ruby-2.2.2/gems/mini_portile-0.6.2/lib/mini_portile.rb:271:in `chdir'
from /Users/rrobin008c/.rvm/gems/ruby-2.2.2/gems/mini_portile-0.6.2/lib/mini_portile.rb:271:in `execute'
from /Users/rrobin008c/.rvm/gems/ruby-2.2.2/gems/mini_portile-0.6.2/lib/mini_portile.rb:66:in `configure'
from /Users/rrobin008c/.rvm/gems/ruby-2.2.2/gems/mini_portile-0.6.2/lib/mini_portile.rb:109:in `cook'
from extconf.rb:278:in `block in process_recipe'
from extconf.rb:177:in `tap'
from extconf.rb:177:in `process_recipe'
from extconf.rb:475:in `<main>'
extconf failed, exit code 1
Gem files will remain installed in /Users/rrobin008c/.rvm/gems/ruby-2.2.2/gems/nokogiri-1.6.6.2 for inspection.
Results logged to /Users/rrobin008c/.rvm/gems/ruby-2.2.2/extensions/x86_64-darwin-14/2.2.0-static/nokogiri-1.6.6.2/gem_make.out

Answer 1

Manually install nokogiri
gem install nokogiri -v VERSION_YOU_WANT -- --use-system-libraries
Check out "nokogiri gem installation error".

Answer 2

Before you run bundle install, run:
bundle config build.nokogiri --use-system-libraries
or
gem install nokogiri -- --use-system-libraries
After that you can run:
bundle install
For other bugs read the Nokogiri install documentation.

Answer 3

I went through the various tutorials and my output looked like this:
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
/Users/rrobin008c/.rvm/rubies/ruby-2.2.1/bin/ruby -r ./siteconf20150812-2574-6ejap3.rb extconf.rb
creating Makefile
make "DESTDIR=" clean
make "DESTDIR="
compiling breakpoint.c
make: /usr/bin/gcc-4.2: No such file or directory
make: *** [breakpoint.o] Error 1
make failed, exit code 2
Gem files will remain installed in /Users/rrobin008c/.rvm/gems/ruby-2.2.1/gems/byebug-5.0.0 for inspection.
Results logged to /Users/rrobin008c/.rvm/gems/ruby-2.2.1/extensions/x86_64-darwin-14/2.2.0-static/byebug-5.0.0/gem_make.out
An error occurred while installing byebug (5.0.0), and Bundler cannot continue.
Make sure that `gem install byebug -v '5.0.0'` succeeds before bundling.
The significant part is
make: /usr/bin/gcc-4.2: No such file or directory
After this I asked:
$which gcc
/usr/bin/gcc
Follow "OS X Mountain Lion: gcc-4.2 No such file or directory" and everything should work after that.

Answer 4

I would recommend running
brew doctor
rvm reinstall
rvm reinstall (ruby version here)
gem pristine all
sudo gem install rails

Answer 5

If you get to many error best thing to do is remove rails and ruby completely
first type this
tarun#tarun:~$ which ruby
/home/tarun/.rbenv/shims/ruby
tarun#tarun:~$ which rails
/home/tarun/.rbenv/shims/rails
then copy the path and use this command to remove the file
rm -rf /home/tarun/.rbenv/shims/ruby
rm -rf /home/tarun/.rbenv/shims/rails
and same way you can check which rbenv and which rvm and remove by using this same method.
And use
grep -rl rails
grep -rl ruby
this will show path of all files which have rails keyword.So that you can know that have you removed rails and ruby completely.
And follow steps given here to reinstall it
https://www.digitalocean.com/community/tutorials/how-to-install-ruby-on-rails-with-rbenv-on-ubuntu-14-04