doc: add LLVM instruction for macOS < 13

Github-Pull: #29934
Rebased-From: 22574046c9
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Sjors Provoost 2024-04-29 10:33:21 +02:00 committed by fanquake
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@ -51,6 +51,20 @@ To install, run the following from your terminal:
brew install automake libtool boost pkg-config libevent
```
For macOS 11 (Big Sur) and 12 (Monterey) you need to install a more recent version of llvm.
``` bash
brew install llvm
```
And append the following to the configure commands below:
``` bash
CC=$(brew --prefix llvm)/bin/clang CXX=$(brew --prefix llvm)/bin/clang++
```
Try `llvm@17` if compilation fails with the default version of llvm.
### 4. Clone Bitcoin repository
`git` should already be installed by default on your system.