Reasonable installPhase for preparePort

tool/prepare-port/setup.sh

@@ -1000,11 +1000,11 @@ checkPhase() {
 installPhase() {
     runHook preInstall
 
-    if [ -n "$prefix" ]; then
-        mkdir -p "$prefix"
+    if [ -n "$source" ]; then
+        mkdir -p "$source"
     fi
 
-    cp -r ./* "$prefix"
+    cp -r ./* "$source"
 
     runHook postInstall
 }