doc: add LLVM instruction for macOS < 13

bitcoin · Apr 29, 2024 · 2257404 · 2257404
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commit 2257404
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diff --git a/doc/build-osx.md b/doc/build-osx.md
@@ -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.