PostGIS 2.4

• Ubuntu, Debian from PostgreSQL Apt Repository
• Debian 9 ("stretch") - uses PostgreSQL 10/9.6
  • from source

PostGIS 2.3

• BigSQL (Linux 64-bit, Mac 64-bit, Windows 64-bit) ​PostGIS 2.3 and ogrfdw

• Ubuntu - PostgreSQL 9.6 and PostGIS 2.3
  • from PostgreSQL Apt Repository

PostGIS 2.2

• Ubuntu - uses PostgreSQL 9.5
  • from PostgreSQL Apt Repository

PostGIS 2.1

• CentOS 6
  • from PGDG YUM/RPM packages

• Debian 7 (wheezy) - uses PostgreSQL 9.1
  • from source

• Fedora 19 (Schrödinger's Cat)
  • using PGDG YUM/RPM packages

• Ubuntu 12.04, 12.10,13.04, 13.10 - uses PostgreSQL 9.3
  • from PostgreSQL Apt Repository

• Ubuntu 12.04 (precise) - uses PostgreSQL 9.1
  • from source

• Ubuntu 13.04 (raring) - uses PostgreSQL 9.1
  • from source

• Ubuntu 13.10 (saucy) - uses PostgreSQL 9.1
  • from source

• Ubuntu 14.04 LTS (trusty) - uses PostgreSQL 9.3
  • from packages
  • from source

For other systems, just follow the 2.0 guides (from source versions). Keep in mind a few dependencies for PostGIS 2.1:

• PostgreSQL 9.0, but 9.1 or later recommended
• GEOS 3.3, but 3.4.0 or later recommended
• GDAL 1.8, but 1.9 or later recommended

PostGIS 2.0

• CentOS 6
  • from PGDG YUM/RPM packages

• Debian 6.0 (squeeze) - uses PostgreSQL 8.4
  • from source

• Debian 7.0 (wheezy) - uses PostgreSQL 9.1
  • from source

• Fedora 16 (Verne)
  • using PGDG YUM/RPM packages

• FreeBSD 9.1/PCBSD 9.1 - with PostgreSQL 9.2
  • from source

• Ubuntu 10.04 LTS (lucid) - uses PostgreSQL 8.4
  • from source

• Ubuntu 11.10 (oneiric) - uses PostgreSQL 9.1
  • from source
  • from packages, using ppa:sharpie

• Ubuntu 12.04 (precise) - uses PostgreSQL 9.1
  • from source
  • hacky hybrid approach

• Ubuntu 12.10 (quantal) - uses PostgreSQL 9.1
  • from source
  • from packages, using ppa:ubuntugis

• Ubuntu 13.04 (raring) - uses PostgreSQL 9.1
  • from source
  • from packages, using ppa:ubuntugis

• Windows both 32-bit and 64-bit (same step for all versions of PostgreSQL)
  • Compiling in Windows all PostgreSQL (x32bit MinGW32)
  • Compiling PostGIS 2.0 under Windows using MinGW-w64/Msys (PostgreSQLx64bit and 9.2+ x32bit)