Homebrew install specific version of formula?

Question

How do I install a specific version of a formula in homebrew? For example, postgresql-8.4.4 instead of the latest 9.0.

Answer 1

Update on the Library/Formula/postgresql.rb line 8 to

http://ftp2.uk.postgresql.org/sites/ftp.postgresql.org/source/v8.4.6/postgresql-8.4.6.tar.bz2

And MD5 on line 9 to

fcc3daaf2292fa6bf1185ec45e512db6

Save and exit.

brew install postgres
initdb /usr/local/var/postgres

Now in this stage you might face the postgresql could not create shared memory segment error, to work around that update the /etc/sysctl.conf like this:

kern.sysv.shmall=65536
kern.sysv.shmmax=16777216

Try initdb /usr/local/var/postgres again, and it should run smooth.

To run postgresql on start

launchctl load -w /usr/local/Cellar/postgresql/8.4.6/org.postgresql.postgres.plist

Hope that helps :)