diff --git a/src/plugins/cmakeprojectmanager/cmakeprojectmanager.cpp b/src/plugins/cmakeprojectmanager/cmakeprojectmanager.cpp
index 959bc243097..4629aa3d5fc 100644
--- a/src/plugins/cmakeprojectmanager/cmakeprojectmanager.cpp
+++ b/src/plugins/cmakeprojectmanager/cmakeprojectmanager.cpp
@@ -171,9 +171,16 @@ QString CMakeManager::findQtDir(const ProjectExplorer::Environment &env)
             QFileInfo qmake(path + "/" + possibleCommand);
             if (qmake.exists()) {
                 if (!qtVersionForQMake(qmake.absoluteFilePath()).isNull()) {
-                    QDir dir(qmake.absoluteDir());
-                    dir.cdUp();
-                    return dir.absolutePath();
+                    QProcess proc;
+                    proc.start(qmake.absoluteFilePath(), QStringList() << "-query" << "QT_INSTALL_DATA");
+                    if (proc.waitForFinished()) {
+                        return proc.readAll().trimmed();
+                    } else {
+                        proc.kill();
+                        QDir dir(qmake.absoluteDir());
+                        dir.cdUp();
+                        return dir.absolutePath();
+                    }
                 }
             }
         }
diff --git a/src/plugins/qt4projectmanager/qtversionmanager.cpp b/src/plugins/qt4projectmanager/qtversionmanager.cpp
index abded6110f1..fe4e3d48770 100644
--- a/src/plugins/qt4projectmanager/qtversionmanager.cpp
+++ b/src/plugins/qt4projectmanager/qtversionmanager.cpp
@@ -870,9 +870,12 @@ void QtVersion::setPath(const QString &path)
 QString QtVersion::dumperLibrary() const
 {
     uint hash = qHash(path());
+    QString qtInstallData = versionInfo().value("QT_INSTALL_DATA");
+    if (qtInstallData.isEmpty())
+        qtInstallData = path();
     QStringList directories;
     directories
-            << (path() + "/qtc-debugging-helper/")
+            << (qtInstallData + "/qtc-debugging-helper/")
             << (QApplication::applicationDirPath() + "/../qtc-debugging-helper/" + QString::number(hash)) + "/"
             << (QDesktopServices::storageLocation(QDesktopServices::DataLocation) + "/qtc-debugging-helper/" + QString::number(hash)) + "/";
     foreach(const QString &directory, directories) {
@@ -1390,9 +1393,12 @@ QString QtVersion::buildDebuggingHelperLibrary()
 
     QString output;
     uint hash = qHash(path());
+    QString qtInstallData = versionInfo().value("QT_INSTALL_DATA");
+    if (qtInstallData.isEmpty())
+        qtInstallData = path();
     QStringList directories;
     directories
-            << path() + "/qtc-debugging-helper/"
+            << qtInstallData + "/qtc-debugging-helper/"
             << QApplication::applicationDirPath() + "/../qtc-debugging-helper/" + QString::number(hash) +"/"
             << QDesktopServices::storageLocation (QDesktopServices::DataLocation) + "/qtc-debugging-helper/" + QString::number(hash) +"/";