make fails during install of json-1.8.0 with unrecognized option '-arch' on OSX 10.8.4

Question

I am trying to get my ruby environment properly setup, but keep receiving errors when attempting to bundle install my test app.

I first get an error when trying to bundle install:

$ rails new app
// [...] 
run bundle install

Fetching gem metadata from https://rubygems.org/..
Resolving dependencies...
Using rake (10.1.0) 
Using i18n (0.6.5) 
Using multi_json (1.7.9) 
Using activesupport (3.2.9) 
Using builder (3.0.4) 
Using activemodel (3.2.9) 
Using erubis (2.7.0) 
Using journey (1.0.4) 
Using rack (1.4.5) 
Using rack-cache (1.2) 
Using rack-test (0.6.2) 
Using hike (1.2.3) 
Using tilt (1.4.1) 
Using sprockets (2.2.2) 
Using actionpack (3.2.9) 
Using mime-types (1.23) 
Using polyglot (0.3.3) 
Using treetop (1.4.14) 
Using mail (2.4.4) 
Using actionmailer (3.2.9) 
Using arel (3.0.2) 
Using tzinfo (0.3.37) 
Using activerecord (3.2.9) 
Using activeresource (3.2.9) 
Using bundler (1.3.5) 
Using coffee-script-source (1.6.3) 
Using execjs (1.4.0) 
Using coffee-script (2.2.0) 
Using rack-ssl (1.3.3) 
Installing json (1.8.0) 
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.

        /Users/ryan/.rvm/rubies/ruby-1.9.3-p327/bin/ruby extconf.rb 
creating Makefile

make
compiling generator.c
gcc-4.6: error: x86_64: No such file or directory
gcc-4.6: error: unrecognized option '-arch'
make: *** [generator.o] Error 1


Gem files will remain installed in /Users/ryan/.rvm/gems/ruby-1.9.3-p327/gems/json-1.8.0 for inspection.
Results logged to /Users/ryan/.rvm/gems/ruby-1.9.3-p327/gems/json-1.8.0/ext/json/ext/generator/gem_make.out
An error occurred while installing json (1.8.0), and Bundler cannot continue.
Make sure that `gem install json -v '1.8.0'` succeeds before bundling.

Following the last line of the error message I attempt to gem install json -v '1.8.0' but get the following:

Building native extensions.  This could take a while...
ERROR:  Error installing json:
        ERROR: Failed to build gem native extension.

        /Users/ryan/.rvm/rubies/ruby-1.9.3-p327/bin/ruby extconf.rb
creating Makefile

make
compiling generator.c
gcc-4.6: error: x86_64: No such file or directory
gcc-4.6: error: unrecognized option '-arch'
make: *** [generator.o] Error 1


Gem files will remain installed in /Users/ryan/.rvm/gems/ruby-1.9.3-p327/gems/json-1.8.0 for inspection.
Results logged to /Users/ryan/.rvm/gems/ruby-1.9.3-p327/gems/json-1.8.0/ext/json/ext/generator/gem_make.out

Any help would be greatly appreciated... I currently using the following versions of rvm, ruby + rails:

$ ruby -v
ruby 1.9.3p327 (2012-11-10) [x86_64-darwin12.2.0]

$ rails -v
Rails 3.2.9

$ rvm -v
rvm 1.22.1 (stable) by Wayne E. Seguin <[email protected]>, Michal Papis <[email protected]> [https://rvm.io/]

Please let me know if you need any other information.

Answer 1

sounds like this can be caused by binary ruby, try:

rvm get head
rvm reinstall 1.9.3-p327 --disable-binary

Answer 2

delete gemfile.lock and run bundle