--- package.cpp (revision 732162)
+++ package.cpp (working copy)
@@ -76,14 +76,14 @@
     }

     foreach (const char *dir, d->structure.requiredDirectories()) {
-        if (QFile::exists(d->basePath + '/' + d->structure.path(dir))) {
+        if (!QFile::exists(d->basePath + d->structure.path(dir))) {
             d->valid = false;
             return false;
         }
     }

     foreach (const char *file, d->structure.requiredFiles()) {
-        if (QFile::exists(d->basePath + '/' + d->structure.path(file))) {
+        if (!QFile::exists(d->basePath + d->structure.path(file))) {
             d->valid = false;
             return false;
         }