gcc-4-8-error

-bash-3.2$ echo $CC
/usr/local/bin/gcc-4.8
-bash-3.2$ bundle install --path .bundle --binstubs .bundle/bin
Fetching gem metadata from https://rubygems.org/.........
Fetching additional metadata from https://rubygems.org/..
Resolving dependencies...
Installing rake 10.3.1
Installing builder 3.2.2
Installing mime-types 2.2
Installing mini_portile 0.5.3

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    /Users/neo/.rubies/ruby-2.1.1/bin/ruby extconf.rb
Extracting libxml2-2.8.0.tar.gz into tmp/x86_64-apple-darwin13.1.0/ports/libxml2/2.8.0... OK
Running 'configure' for libxml2 2.8.0... OK
Running 'compile' for libxml2 2.8.0... OK
Running 'install' for libxml2 2.8.0... OK
Activating libxml2 2.8.0 (from /usr/local/gemserver/.bundle/ruby/2.1.0/gems/nokogiri-1.6.1/ports/x86_64-apple-darwin13.1.0/libxml2/2.8.0)...
Extracting libxslt-1.1.26.tar.gz into tmp/x86_64-apple-darwin13.1.0/ports/libxslt/1.1.26... OK
Running 'configure' for libxslt 1.1.26... OK
Running 'compile' for libxslt 1.1.26... OK
Running 'install' for libxslt 1.1.26... OK
Activating libxslt 1.1.26 (from /usr/local/gemserver/.bundle/ruby/2.1.0/gems/nokogiri-1.6.1/ports/x86_64-apple-darwin13.1.0/libxslt/1.1.26)...
checking for libxml/parser.h... yes
checking for libxslt/xslt.h... yes
checking for libexslt/exslt.h... yes
checking for iconv_open() in iconv.h... no
checking for iconv_open() in -liconv... yes
checking for xmlParseDoc() in -lxml2... yes
checking for xsltParseStylesheetDoc() in -lxslt... yes
checking for exsltFuncRegister() in -lexslt... yes
checking for xmlHasFeature()... yes
checking for xmlFirstElementChild()... yes
checking for xmlRelaxNGSetParserStructuredErrors()... yes
checking for xmlRelaxNGSetParserStructuredErrors()... yes
checking for xmlRelaxNGSetValidStructuredErrors()... yes
checking for xmlSchemaSetValidStructuredErrors()... yes
checking for xmlSchemaSetParserStructuredErrors()... yes
creating Makefile

make "DESTDIR=" clean

make "DESTDIR="
compiling html_document.c
gcc-4.8: error: unrecognized command line option '-Wshorten-64-to-32'
gcc-4.8: error: unrecognized command line option '-Wdivision-by-zero'
gcc-4.8: error: unrecognized command line option '-Wextra-tokens'
make: *** [html_document.o] Error 1

make failed, exit code 2

Gem files will remain installed in /usr/local/gemserver/.bundle/ruby/2.1.0/gems/nokogiri-1.6.1 for inspection.
Results logged to /usr/local/gemserver/.bundle/ruby/2.1.0/extensions/x86_64-darwin-13/2.1.0-static/nokogiri-1.6.1/gem_make.out
An error occurred while installing nokogiri (1.6.1), and Bundler cannot continue.
Make sure that `gem install nokogiri -v '1.6.1'` succeeds before bundling.
-bash-3.2$ export CC=gcc
-bash-3.2$ echo $CC
gcc
-bash-3.2$ bundle install --path .bundle --binstubs .bundle/bin
Fetching gem metadata from https://rubygems.org/.........
Fetching additional metadata from https://rubygems.org/..
Resolving dependencies...
Using rake 10.3.1
Using builder 3.2.2
Using mime-types 2.2
Using mini_portile 0.5.3
Installing nokogiri 1.6.1
Installing rack 1.5.2
Installing rack-test 0.6.2
Installing xpath 2.0.0
Installing capybara 2.1.0
Installing unf_ext 0.0.6
Installing unf 0.1.4
Installing domain_name 0.5.18
Installing http-cookie 1.0.2
Installing net-http-digest_auth 1.4
Installing net-http-persistent 2.9.4
Installing ntlm-http 0.1.1
Installing webrobots 0.1.1
Installing mechanize 2.7.3
Installing capybara-mechanize 1.1.0
Installing multipart-post 2.0.0
Installing faraday 0.9.0
Installing httpclient 2.3.4.1
Installing nesty 1.0.2
Installing rack-protection 1.5.3
Installing tilt 1.4.1
Installing sinatra 1.4.5
Installing geminabox 0.12.4
Installing hashie 2.1.1
Installing minitest 5.3.3
Installing remote_partial 0.7.3
Using bundler 1.6.2
Your bundle is complete!
It was installed into ./.bundle