From fd12dd942f61a0a22016fa219f4b3a87c81dc0b0 Mon Sep 17 00:00:00 2001
From: Stefan Radig <stefan@neon.tech>
Date: Thu, 5 Sep 2024 17:48:51 +0200
Subject: [PATCH] Add installation instructions for m4 on mac (#8929)

## Problem
Building on MacOS failed due to missing m4. Although a window was
popping up claiming to install m4, this was not helping.

## Summary of changes
Add instructions to install m4 using brew and link it (thanks to Folke
for helping).
---
 README.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/README.md b/README.md
index 735edef0fc..b54956f773 100644
--- a/README.md
+++ b/README.md
@@ -64,6 +64,12 @@ brew install protobuf openssl flex bison icu4c pkg-config
 echo 'export PATH="$(brew --prefix openssl)/bin:$PATH"' >> ~/.zshrc
 ```
 
+If you get errors about missing `m4` you may have to install it manually:
+```
+brew install m4
+brew link --force m4
+```
+
 2. [Install Rust](https://www.rust-lang.org/tools/install)
 ```
 # recommended approach from https://www.rust-lang.org/tools/install