From 8b2599153785a43836f4030c727b1aeeca1de6e1 Mon Sep 17 00:00:00 2001
From: Floris Bos <bos@je-eigen-domein.nl>
Date: Sat, 27 Nov 2021 19:11:09 +0100
Subject: [PATCH] README.md: mention disabling parallel build on Pi

On bullseye it seems to default to 'make -j4' which will results
in OOM when it runs out of swap

==
[ 3004.100215] Out of memory: Killed process 6983 (cc1plus) total-vm:211660kB, anon-rss:170332kB, file-rss:0kB, shmem-rss:0kB, UID:1000 pgtables:428kB oom_score_adj:0
==

Mention how to disable parallel build in README.md
---
 README.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/README.md b/README.md
index d3675b4..da60f6b 100644
--- a/README.md
+++ b/README.md
@@ -30,6 +30,14 @@ sudo apt install --no-install-recommends build-essential devscripts debhelper cm
 git clone --depth 1 https://github.com/raspberrypi/rpi-imager
 ```
 
+#### Building on the Pi
+
+If building on a device with limited memory (e.g. 1 GB Pi), disable parallel build or it may run out of memory:
+
+```
+export DEB_BUILD_OPTIONS="parallel=1"
+```
+
 #### Build the Debian package
 
 ```