Manually link brew libraries on failure

src/scripts/darwin.sh

@@ -119,6 +119,9 @@ restore_library_helper() {
   if ! [ -d "$brew_prefix/opt/$dep_name" ]; then
     brew link --force --overwrite "$dep_name" 2>/dev/null || true
   fi
+  if ! [ -d "$brew_prefix/opt/$dep_name" ]; then
+    sudo ln -sf "$brew_cellar"/"$dep_name"/* "$brew_prefix"/opt/libffi
+  fi  
 }
 
 restore_library() {