Make postgresql easier by using this vagrant box which is a pre-packaged postgresql server with a JSON table ready to go.
Head on over to the pgbox site, watch the video and follow the instructions there.
You DO NOT HAVE TO DO THIS - this is for administrators only, so they can make new versions of the pgdevbox.
Box making stuff is in the make subdirectory.
cd make
vagrant up
... box is provisioned...
vagrant package
rsync package.box boxhost