--- qmake/project.cpp.orig
+++ qmake/project.cpp
@@ -596,14 +596,17 @@
             }
         }
     }
-    for(QStringList::Iterator concat_it = concat.begin();
-        concat_it != concat.end(); ++concat_it)
+    QByteArray qmake_no_defaults = qgetenv("QMAKE_NO_DEFAULTS");
+    if (qmake_no_defaults.isNull()) {
+      for(QStringList::Iterator concat_it = concat.begin();
+	  concat_it != concat.end(); ++concat_it)
         feature_roots << (QLibraryInfo::location(QLibraryInfo::PrefixPath) +
                           mkspecs_concat + (*concat_it));
-    for(QStringList::Iterator concat_it = concat.begin();
-        concat_it != concat.end(); ++concat_it)
+      for(QStringList::Iterator concat_it = concat.begin();
+	  concat_it != concat.end(); ++concat_it)
         feature_roots << (QLibraryInfo::location(QLibraryInfo::DataPath) +
                           mkspecs_concat + (*concat_it));
+    }
     return feature_roots;
 }
 
@@ -617,8 +620,10 @@
         for(QStringList::ConstIterator it = lst.begin(); it != lst.end(); ++it)
             ret << ((*it) + concat);
     }
-    ret << QLibraryInfo::location(QLibraryInfo::DataPath) + concat;
-
+    QByteArray qmake_no_defaults = qgetenv("QMAKE_NO_DEFAULTS");
+    if (qmake_no_defaults.isNull()) {
+      ret << QLibraryInfo::location(QLibraryInfo::DataPath) + concat;
+    }
     return ret;
 }