From 5ff5f17377432645f65bc614228783cccb69d20c Mon Sep 17 00:00:00 2001
From: Andy Balaam <andyb@element.io>
Date: Thu, 13 Jan 2022 16:33:37 +0000
Subject: [PATCH] Mention python3-venv and libpq-dev dependencies in
 contribution guide (#11740)

---
 changelog.d/11740.doc                  | 1 +
 docs/development/contributing_guide.md | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)
 create mode 100644 changelog.d/11740.doc

diff --git a/changelog.d/11740.doc b/changelog.d/11740.doc
new file mode 100644
index 0000000000..dce080a5e9
--- /dev/null
+++ b/changelog.d/11740.doc
@@ -0,0 +1 @@
+Mention python3-venv and libpq-dev dependencies in contribution guide.
diff --git a/docs/development/contributing_guide.md b/docs/development/contributing_guide.md
index 121f7c0687..c142981693 100644
--- a/docs/development/contributing_guide.md
+++ b/docs/development/contributing_guide.md
@@ -20,7 +20,9 @@ recommended for development. More information about WSL can be found at
 <https://docs.microsoft.com/en-us/windows/wsl/install>. Running Synapse natively
 on Windows is not officially supported.
 
-The code of Synapse is written in Python 3. To do pretty much anything, you'll need [a recent version of Python 3](https://wiki.python.org/moin/BeginnersGuide/Download).
+The code of Synapse is written in Python 3. To do pretty much anything, you'll need [a recent version of Python 3](https://www.python.org/downloads/). Your Python also needs support for [virtual environments](https://docs.python.org/3/library/venv.html). This is usually built-in, but some Linux distributions like Debian and Ubuntu split it out into its own package. Running `sudo apt install python3-venv` should be enough.
+
+Synapse can connect to PostgreSQL via the [psycopg2](https://pypi.org/project/psycopg2/) Python library. Building this library from source requires access to PostgreSQL's C header files. On Debian or Ubuntu Linux, these can be installed with `sudo apt install libpq-dev`.
 
 The source code of Synapse is hosted on GitHub. You will also need [a recent version of git](https://github.com/git-guides/install-git).
 
-- 
GitLab