diff --git a/Library/Homebrew/shims/mac/super/include/llvm/__config_site b/Library/Homebrew/shims/mac/super/include/llvm/__config_site
new file mode 100644
index 0000000000..8991dc948a
--- /dev/null
+++ b/Library/Homebrew/shims/mac/super/include/llvm/__config_site
@@ -0,0 +1,7 @@
+#ifndef _HOMEBREW_LIBCPP___CONFIG_SITE
+#define _HOMEBREW_LIBCPP___CONFIG_SITE
+
+#include_next <__config_site>
+#define _LIBCPP_HAS_VENDOR_AVAILABILITY_ANNOTATIONS 1
+
+#endif // _HOMEBREW_LIBCPP___CONFIG_SITE
diff --git a/Library/Homebrew/shims/super/cc b/Library/Homebrew/shims/super/cc
index b5424f4d22..5401bdb85f 100755
--- a/Library/Homebrew/shims/super/cc
+++ b/Library/Homebrew/shims/super/cc
@@ -324,6 +324,9 @@ class Cmd
     args << "-std=c++11" if cxx11?
     args << "-stdlib=libc++" if libcxx?
     args << "-stdlib=libstdc++" if libstdcxx?
+    if ENV["HOMEBREW_CC"] == "llvm_clang" && mac?
+      args << "-I#{ENV["HOMEBREW_LIBRARY"]}/Homebrew/shims/mac/super/include/llvm"
+    end
     args
   end