From 84e6ec18d3afec8482195b078edbcad3848135cc Mon Sep 17 00:00:00 2001
From: Ms2ger <ms2ger@gmail.com>
Date: Sat, 6 Sep 2014 12:06:55 +0200
Subject: [PATCH] Add a note about autoconf 2.13.

Many people seem to have this question.
---
 README.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/README.md b/README.md
index dabdc465ced..1049b9539e6 100644
--- a/README.md
+++ b/README.md
@@ -51,6 +51,11 @@ sudo pacman -S base-devel autoconf2.13 git gperf python2 \
     python2-virtualenv mesa libxrandr libxi libgl glu ttf-font
 ```
 
+Note: autoconf 2.13 is required for SpiderMonkey; the autoconf project did not
+preserve backwards compatibility after version 2.13, and changing the Firefox
+build to work with a newer version is not considered a good use of developers'
+time.
+
 Cross-compilation for Android:
 
 Basically, pre-installed Android tools are needed.