eliminate the annoying nokogiri LibXML version mismatch on OSX

fix_nokogiri_libxml_mismatch_on_mavericks.sh

#!/bin/bash

# FIXME:
# WARNING: Nokogiri was built against LibXML version 2.9.0, but has dynamically loaded 2.8.0

NOKOGIRIR_VERSION=${1:-1.6.1}
LIBXML_VERSION=${2:-2.9.1}
LIBXSLT_VERSION=${3:-1.1.28}

gem uninstall nokogiri libxml-ruby

brew update
brew uninstall libxml2
brew install libxml2 --with-xml2-config
brew link libxml2

brew install libxslt
brew unlink libxslt

bundle config build.nokogiri \
--with-xml2-include=/usr/local/Cellar/libxml2/$LIBXML_VERSION/include/libxml2 \
--with-xml2-lib=/usr/local/Cellar/libxml2/$LIBXML_VERSION/lib \
--with-xslt-dir=/usr/local/Cellar/libxslt/$LIBXSLT_VERSION \
--with-iconv-include=/usr/local/opt/libiconv/include \
--with-iconv-lib=/usr/local/opt/libiconv/lib

gem install nokogiri -v $NOKOGIRIR_VERSION --
--with-xml2-include=/usr/local/Cellar/libxml2/$LIBXML_VERSION/include/libxml2
--with-xml2-lib=/usr/local/Cellar/libxml2/$LIBXML_VERSION/lib
--with-xslt-dir=/usr/local/Cellar/libxslt/$LIBXSLT_VERSION
--with-iconv-include=/usr/local/opt/libiconv/include
--with-iconv-lib=/usr/local/opt/libiconv/lib

# test that it worked
 curl -s http://nokogiri.org | nokogiri -e'p $_.css("h1").length'

# modifed from earlier sources:
# https://gist.github.com/746966
# https://gist.github.com/1226596