diff --git a/trick_source/codegen/Interface_Code_Gen/HeaderSearchDirs.cpp b/trick_source/codegen/Interface_Code_Gen/HeaderSearchDirs.cpp
index f58f6dc7..59c4ce83 100644
--- a/trick_source/codegen/Interface_Code_Gen/HeaderSearchDirs.cpp
+++ b/trick_source/codegen/Interface_Code_Gen/HeaderSearchDirs.cpp
@@ -92,6 +92,9 @@ void HeaderSearchDirs::AddCompilerBuiltInSearchDirs () {
     }
     pclose(fp) ;
 
+    // Homebrew on Macs puts everything in /usr/local/Cellar.
+    hso.AddPath("/usr/local/Cellar" , clang::frontend::System, IsFramework, IsSysRootRelative);
+
 }
 
 void HeaderSearchDirs::AddUserSearchDirs ( std::vector<std::string> & include_dirs ) {