diff --git a/11-Building-on-MacOS.md b/11-Building-on-MacOS.md
index 98ab8ce..4cfdabf 100644
--- a/11-Building-on-MacOS.md
+++ b/11-Building-on-MacOS.md
@@ -20,6 +20,7 @@ You will need Intel versions of all the dependencies.  **Dependencies from Homeb
 
 Add the following extra flags to the cmake invocation listed in the Intel Mac section:
 - `-DCMAKE_OSX_ARCHITECTURES=x86_64`.  This tells cmake to do an Intel build even though you're on an arm Mac.
+- `-DCMAKE_IGNORE_PATH="/opt/homebrew"`. This tells the linker to ignore any homebrew dependencies. This may be required when cross compiling from arm64 to x86_64.
 
 # Building for development