11th October 2018: PostgreSQL 11 RC 1 Released!
Supported Versions: Current (10) / 9.6 / 9.5 / 9.4 / 9.3
Development Versions: 11 / devel
Unsupported versions: 9.2 / 9.1 / 9.0 / 8.4 / 8.3 / 8.2 / 8.1 / 8.0 / 7.4 / 7.3 / 7.2 / 7.1

14.3. Getting The Source

The PostgreSQL 8.1.23 sources can be obtained by anonymous FTP from ftp://ftp.postgresql.org/pub/source/v8.1.23/postgresql-8.1.23.tar.gz. Other download options can be found on our website: http://www.postgresql.org/download/. After you have obtained the file, unpack it:

gunzip postgresql-8.1.23.tar.gz
tar xf postgresql-8.1.23.tar

This will create a directory postgresql-8.1.23 under the current directory with the PostgreSQL sources. Change into that directory for the rest of the installation procedure.