Step 1: PostgreSQL

You can download a binary installer from the PostgreSQL site. It will install Postgre to your /Library folder. This should take care of the Postgre part.

Step 2: Sql-Ledger

Ledger is written in perl, and requires perl to run. Luckily Snow Leopard comes standard with perl. What it does not come standard with is the perl binding for PostgreSQL. The following 3 commands will take care of that:

sudo perl -MCPAN -e "install +YAML"
YAML is not necessary but it can be helpful, and lacking YAML might give you problems with DBI.

sudo perl -MCPAN -e "install DBI"

sudo perl -MCPAN -e "install DBD::Pg"

This will install the perl binding for PostreSQL.

Download Sql-Ledger from here. As of this writing, the latest version is 2.8.31

Unzip and untar the archive and follow the instructions in the readme file. I did not manage to build using the automated script and had to do everything by hand. There is also this page on the ledger page with a somewhat oldish instructions for OS X.

Once Ledger is tested and it is working, its time to get the python binding

Step 3: Python binding

The pyhton binding is for PostgreSQL. You can get the binding library, called Psycopg2 (don’t ask me why) from here. Download and upack it. Installing is done by running:
python setup.py build
sudo python setup.py install
If you are not able to build it might be a problem with your path. Python is trying to link to the PostgreSQL bin files. Try to add it to your path and then to build again.

And your done. Enjoy (or not) working with Django-Sql-Ledger

An interesting talk about secret software and why it should not be allowed in the public sector