Minimum Dependency Versions
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This documents the minimum supported versions of the build and test dependencies for Postgres, as listed in the documentation, alongside any known rationale for keeping those particular versions.
Hopefully this makes it easier to remember what's holding a version back.
| Name | Minimum Version | Rationale |
|---|---|---|
| GNU Make | 3.81 | As of 2025, Apple still ships this on macOS (last GPL v2 version). |
| Meson | 0.57.2 | See comments in top-level meson.build. (RHEL 8) |
| C Compiler | GCC 4.7 / Clang ≈3.3 / VS 2019 (16.5) | C11 but without _Generic, _Atomic, _Thread_local. RHEL7 ships GCC 4.8. See discussion for PG19. |
| Flex | 2.5.34 | See commit 0869ea43e9c. |
| Bison | 2.3 | Ships with macOS (last GPL v2 version). |
| GNU Readline | ||
| libedit | ||
| zlib | ||
| ICU4C | 4.2 | CentOS 6 (see commit eccead9ed43, obsolete) |
| Perl | 5.14 | Shipped with Debian 7 (Wheezy), which is used in the buildfarm for obscure 32-bit architecture testing. |
| Python | 3.6.8 | Base version shipped with RHEL8. |
| Tcl | 8.4 | See commit e2609323eb5. |
| gettext | ||
| OpenSSL | 1.1.1 | Base version shipped with RHEL8. |
| LibreSSL | 3.4 | Shipped with OpenBSD 7. |
| MIT Kerberos | ||
| Curl | 7.61 | Shipped with RHEL8. Allows control over TLS 1.3 ciphers. |
| LZ4 | ||
| zstd | 1.4.0 |
The current development cycle is PG20. Historical revisions are linked below, for back branches:
