You don't need sudo to work with brew read here.

The main problem is your own permission on /usr/local folder to execute these actions.Try this (make sure that you login as administrator role):

sudo chmod go+w /usr/local

And then try again:

brew unlink ossp-uuid && brew link ossp_uuid

And final:

brew install postgresql

You don't need sudo to work with brew read here.

The main problem is your own permission on /usr/local folder to execute these actions.Try this (make sure that you login as administrator role):

sudo chmod go+w /usr/local

Then try again:

brew unlink ossp-uuid && brew link ossp-uuid

and:

brew install postgresql