Index: Sources/Qt4/qt/qmake/generators/mac/pbuilder_pbx.cpp
===================================================================
--- Sources/Qt4/qt/qmake/generators/mac/pbuilder_pbx.cpp	(revision 3739)
+++ Sources/Qt4/qt/qmake/generators/mac/pbuilder_pbx.cpp	(revision 3741)
@@ -920,8 +920,11 @@
                     QString key = keyFor(library);
                     bool is_frmwrk = (library.endsWith(".framework"));
                     t << "\t\t" << key << " = {" << "\n"
-                      << "\t\t\t" << writeSettings("isa", (is_frmwrk ? "PBXFrameworkReference" : "PBXFileReference"), SettingsNoQuote) << ";" << "\n"
-                      << "\t\t\t" << writeSettings("name", escapeFilePath(name)) << ";" << "\n"
+                      << "\t\t\t" << writeSettings("isa", "PBXFileReference", SettingsNoQuote) << ";" << "\n";
+                      if(is_frmwrk) {
+                          t << "\t\t\t" << writeSettings("lastKnownFileType", "wrapper.framework", SettingsNoQuote) << ";" << "\n";
+                      }
+                    t << "\t\t\t" << writeSettings("name", escapeFilePath(name)) << ";" << "\n"
                       << "\t\t\t" << writeSettings("path", escapeFilePath(library)) << ";" << "\n"
                       << "\t\t\t" << writeSettings("refType", QString::number(reftypeForFile(library)), SettingsNoQuote) << ";" << "\n"
                       << "\t\t\t" << writeSettings("sourceTree", sourceTreeForFile(library)) << ";" << "\n"