Error installing pg gem on osx

Question

I am on osx 10.6.7 trying to run bundle install on a new rails 3.0.7 app and it keeps failing when trying to build the pg gem. It keeps telling me that I have need the devel

Answer 1

What worked for me was Zag Zag's comment:

~/projects/foo$ env ARCHFLAGS="-arch x86_64" gem install pg
Building native extensions.  This could take a while...
Successfully installed pg-0.11.0
1 gem installed
Building YARD (yri) index for pg-0.11.0...

~/projects/foo$ bundle 
...
Using pg (0.11.0) 
...
Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.