rails cannot install nokogiri w Mavericks & rbenv - ruby-on-rails

Question

running OSX 10.9.4 and XCode 5.1.1, I switched recently from rvm to Rbenv, so I need to reinstall some gems, not a big deal, but...
I am stuck w Nokogiri gem installation, even after downloading and installing october version of the XCode command line tool and running :
sudo xcode-select -s /Library/Developer/CommandLineTools/
I also installed libxml2 libxslt w brew
I am still getting an error, is there any way to solve this issue ?
yves$ gem install nokogiri
Building native extensions. This could take a while...
Building nokogiri using packaged libraries.
ERROR: Error installing nokogiri:
ERROR: Failed to build gem native extension.
/Users/yves/.rbenv/versions/2.1.2/bin/ruby extconf.rb
Building nokogiri using packaged libraries.
checking for iconv.h... *** 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/yves/.rbenv/versions/2.1.2/bin/ruby
--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/yves/.rbenv/versions/2.1.2/lib/ruby/2.1.0/mkmf.rb:456:in `try_do': The compiler failed to generate an executable file. (RuntimeError)
You have to install development tools first.
from /Users/yves/.rbenv/versions/2.1.2/lib/ruby/2.1.0/mkmf.rb:587:in `try_cpp'
from /Users/yves/.rbenv/versions/2.1.2/lib/ruby/2.1.0/mkmf.rb:1067:in `block in have_header'
from /Users/yves/.rbenv/versions/2.1.2/lib/ruby/2.1.0/mkmf.rb:918:in `block in checking_for'
from /Users/yves/.rbenv/versions/2.1.2/lib/ruby/2.1.0/mkmf.rb:351:in `block (2 levels) in postpone'
from /Users/yves/.rbenv/versions/2.1.2/lib/ruby/2.1.0/mkmf.rb:321:in `open'
from /Users/yves/.rbenv/versions/2.1.2/lib/ruby/2.1.0/mkmf.rb:351:in `block in postpone'
from /Users/yves/.rbenv/versions/2.1.2/lib/ruby/2.1.0/mkmf.rb:321:in `open'
from /Users/yves/.rbenv/versions/2.1.2/lib/ruby/2.1.0/mkmf.rb:347:in `postpone'
from /Users/yves/.rbenv/versions/2.1.2/lib/ruby/2.1.0/mkmf.rb:917:in `checking_for'
from /Users/yves/.rbenv/versions/2.1.2/lib/ruby/2.1.0/mkmf.rb:1066:in `have_header'
from extconf.rb:103:in `have_iconv?'
from extconf.rb:148:in `block (2 levels) in iconv_prefix'
from extconf.rb:90:in `preserving_globals'
from extconf.rb:143:in `block in iconv_prefix'
from extconf.rb:120:in `each_iconv_idir'
from extconf.rb:137:in `iconv_prefix'
from extconf.rb:427:in `block in <main>'
from extconf.rb:161:in `block in process_recipe'
from extconf.rb:154:in `tap'
from extconf.rb:154:in `process_recipe'
from extconf.rb:422:in `<main>'
extconf failed, exit code 1
Gem files will remain installed in /Users/yves/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/nokogiri-1.6.3 for inspection.
Results logged to /Users/yves/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/extensions/x86_64-darwin-13/2.1.0-static/nokogiri-1.6.3/gem_make.out
when installing libxml2 libxslt I got a warning , it may interfere with the nokogiri installation ?
yves$ brew install libxml2 libxslt
==> Downloading https://downloads.sf.net/project/machomebrew/Bottles/libxml2-2.9
######################################################################## 100.0%
==> Pouring libxml2-2.9.1.mavericks.bottle.1.tar.gz
==> Caveats
This formula is keg-only, so it was not symlinked into /usr/local.
Mac OS X already provides this software and installing another version in
parallel can cause all kinds of trouble.
Generally there are no consequences of this for you. If you build your
own software and it requires this formula, you'll need to add to your
build variables:
LDFLAGS: -L/usr/local/opt/libxml2/lib
CPPFLAGS: -I/usr/local/opt/libxml2/include
what should i do next ? thanks for your advices

Answer 1

I got the same error a few weeks ago. This is how I solved it:
You'll have to install the broken libraries manually. Use Homebrew, which is a package manager for OS X. Make sure you update first brew update, then install the libraries:
brew install libxml2 libxslt
brew link libxml2 libxslt
You may have to install libiconv from source:
wget http://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.13.1.tar.gz
tar xvfz libiconv-1.13.1.tar.gz
cd libiconv-1.13.1
./configure --prefix=/usr/local/Cellar/libiconv/1.13.1
make
sudo make install
And then you should be able to install the gem.
Quoted from documentation here:
http://nokogiri.org/tutorials/installing_nokogiri.html#homebrew_09
You may also need to run rbenv rehash after installing the libraries.

Answer 2

I have found the solution on one of the forums:
https://github.com/sparklemotion/nokogiri/issues/1111
After almost a week of searching this finally did the trick:
sudo ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future gem install nokogiri -- --with-iconv-include=/usr/local/Cellar/libiconv/1.13.1/include --with-iconv-lib=/usr/local/Cellar/libiconv/1.13.1/lib
GL

Answer 3

I got the same issue few days ago and this thread helped me
https://github.com/sparklemotion/nokogiri/issues/1111
Finally the command which worked for me
gem install nokogiri -- --with-xslt-dir=/usr/local/opt/libxslt