Building pg gem on OS X Snow Leopard
After PostgreSQL has been installed with ports, pg_config and other tools
can be found in "/opt/local/lib/postgresql84/bin". Add this path to
$PATH and set ARCHFLAGS="-arch x86_64".
These can be set within the same command line when installing the gem:
PATH=${PATH}:/opt/local/lib/postgresql84/bin ARCHFLAGS="-arch x86_64" gem install pg
They can also be set in their own right:
export PATH=${PATH}:/opt/local/lib/postgresl84/bin
export ARCHFLAGS="-arch x86_64"
bundle