diff --git a/src/plugins/qt4projectmanager/qt-s60/s60projectchecker.cpp b/src/plugins/qt4projectmanager/qt-s60/s60projectchecker.cpp
index fc24e81f2da..b77bbffce1e 100644
--- a/src/plugins/qt4projectmanager/qt-s60/s60projectchecker.cpp
+++ b/src/plugins/qt4projectmanager/qt-s60/s60projectchecker.cpp
@@ -44,12 +44,11 @@ using namespace Qt4ProjectManager;
 using namespace Qt4ProjectManager::Internal;
 
 QList<ProjectExplorer::Task>
-S60ProjectChecker::reportIssues(const QString &proFile, const QtVersion *version)
+S60ProjectChecker::reportIssues(const QString &proFile)
 {
     QList<ProjectExplorer::Task> results;
-    const QString epocRootDir = version->systemRoot();
-    QFileInfo cppheader(epocRootDir + QLatin1String("/epoc32/include/stdapis/string.h"));
 #if defined (Q_OS_WIN)
+    const QString epocRootDir = version->systemRoot();
     // Report an error if project- and epoc directory are on different drives:
     if (!epocRootDir.startsWith(proFile.left(3), Qt::CaseInsensitive) && !version->isBuildWithSymbianSbsV2()) {
         results.append(Task(Task::Error,
@@ -58,19 +57,6 @@ S60ProjectChecker::reportIssues(const QString &proFile, const QtVersion *version
                             QString(), -1, ProjectExplorer::Constants::TASK_CATEGORY_BUILDSYSTEM));
     }
 #endif
-    // Report an error if EPOC root is not set:
-    if (epocRootDir.isEmpty() || !QDir(epocRootDir).exists()) {
-        results.append(Task(Task::Error,
-                            QCoreApplication::translate("ProjectExplorer::Internal::S60ProjectChecker",
-                                                        "The Symbian SDK was not found for Qt version %1.").arg(version->displayName()),
-                            QString(), -1, ProjectExplorer::Constants::TASK_CATEGORY_BUILDSYSTEM));
-    }
-    if (!cppheader.exists()) {
-        results.append(Task(Task::Error,
-                            QCoreApplication::translate("ProjectExplorer::Internal::S60ProjectChecker",
-                                                        "The \"Open C/C++ plugin\" is not installed in the Symbian SDK or the Symbian SDK path is misconfigured for Qt version %1.").arg(version->displayName()),
-                            QString(), -1, ProjectExplorer::Constants::TASK_CATEGORY_BUILDSYSTEM));
-    }
 
     // Warn of strange characters in project name and path:
     const QString projectName = proFile.mid(proFile.lastIndexOf(QLatin1Char('/')) + 1);
@@ -98,8 +84,8 @@ S60ProjectChecker::reportIssues(const QString &proFile, const QtVersion *version
 }
 
 QList<ProjectExplorer::Task>
-S60ProjectChecker::reportIssues(const Qt4Project *project, const QtVersion *version)
+S60ProjectChecker::reportIssues(const Qt4Project *project)
 {
     QString proFile = project->file()->fileName();
-    return reportIssues(proFile, version);
+    return reportIssues(proFile);
 }
diff --git a/src/plugins/qt4projectmanager/qt-s60/s60projectchecker.h b/src/plugins/qt4projectmanager/qt-s60/s60projectchecker.h
index 8aa2129c1ac..034962b139c 100644
--- a/src/plugins/qt4projectmanager/qt-s60/s60projectchecker.h
+++ b/src/plugins/qt4projectmanager/qt-s60/s60projectchecker.h
@@ -50,14 +50,14 @@ public:
     /// @return a list of tasks, ordered on severity (errors first, then
     ///         warnings and finally info items.
     static QList<ProjectExplorer::Task>
-    reportIssues(const QString &proFile, const QtVersion *version);
+    reportIssues(const QString &proFile);
 
     /// Check a project/Qt version combination on possible issues with
     /// its symbian setup.
     /// @return a list of tasks, ordered on severity (errors first, then
     ///         warnings and finally info items.
     static QList<ProjectExplorer::Task>
-    reportIssues(const Qt4Project *project, const QtVersion *version);
+    reportIssues(const Qt4Project *project);
 };
 
 } // namespace Internal
diff --git a/src/plugins/qt4projectmanager/qtversionmanager.cpp b/src/plugins/qt4projectmanager/qtversionmanager.cpp
index a478ec94ea2..cff1e5d2811 100644
--- a/src/plugins/qt4projectmanager/qtversionmanager.cpp
+++ b/src/plugins/qt4projectmanager/qtversionmanager.cpp
@@ -612,7 +612,9 @@ QtVersion::QtVersion(const QString &name, const QString &qmakeCommand, int id,
     m_defaultConfigIsDebugAndRelease(true),
     m_hasExamples(false),
     m_hasDemos(false),
-    m_hasDocumentation(false)
+    m_hasDocumentation(false),
+    m_qmakeIsExecutable(false),
+    m_validSystemRoot(true)
 {
     if (id == -1)
         m_id = getUniqueId();
@@ -637,7 +639,9 @@ QtVersion::QtVersion(const QString &name, const QString &qmakeCommand,
     m_defaultConfigIsDebugAndRelease(true),
     m_hasExamples(false),
     m_hasDemos(false),
-    m_hasDocumentation(false)
+    m_hasDocumentation(false),
+    m_qmakeIsExecutable(false),
+    m_validSystemRoot(true)
 {
     m_id = getUniqueId();
     setQMakeCommand(qmakeCommand);
@@ -658,7 +662,9 @@ QtVersion::QtVersion(const QString &qmakeCommand, bool isAutodetected, const QSt
     m_defaultConfigIsDebugAndRelease(true),
     m_hasExamples(false),
     m_hasDemos(false),
-    m_hasDocumentation(false)
+    m_hasDocumentation(false),
+    m_qmakeIsExecutable(false),
+    m_validSystemRoot(true)
 {
     m_id = getUniqueId();
     setQMakeCommand(qmakeCommand);
@@ -679,7 +685,9 @@ QtVersion::QtVersion()
     m_defaultConfigIsDebugAndRelease(true),
     m_hasExamples(false),
     m_hasDemos(false),
-    m_hasDocumentation(false)
+    m_hasDocumentation(false) ,
+    m_qmakeIsExecutable(false),
+    m_validSystemRoot(true)
 {
     setQMakeCommand(QString());
 }
@@ -802,7 +810,7 @@ QtVersion::reportIssues(const QString &proFile, const QString &buildDir)
     QSet<QString> targets = supportedTargetIds();
     if (targets.contains(Constants::S60_DEVICE_TARGET_ID) ||
         targets.contains(Constants::S60_EMULATOR_TARGET_ID))
-        results.append(S60ProjectChecker::reportIssues(proFile, this));
+        results.append(S60ProjectChecker::reportIssues(proFile));
     return results;
 }
 
@@ -1153,8 +1161,6 @@ static bool queryQMakeVariables(const QString &binary, QHash<QString, QString> *
 {
     const int timeOutMS = 30000; // Might be slow on some machines.
     QFileInfo qmake(binary);
-    if (!qmake.exists() || !qmake.isExecutable())
-        return false;
     static const char * const variables[] = {
              "QT_VERSION",
              "QT_INSTALL_DATA",
@@ -1217,6 +1223,13 @@ void QtVersion::updateVersionInfo() const
     m_hasQmlDump = false;
     m_hasQmlDebuggingLibrary = false;
     m_hasQmlObserver = false;
+    m_qmakeIsExecutable = true;
+
+    QFileInfo fi(qmakeCommand());
+    if (!fi.exists() || !fi.isExecutable()) {
+        m_qmakeIsExecutable = false;
+        return;
+    }
 
     if (!queryQMakeVariables(qmakeCommand(), &m_versionInfo))
         return;
@@ -1387,6 +1400,7 @@ void QtVersion::updateAbiAndMkspec() const
 
     m_targetIds.clear();
     m_abis.clear();
+    m_validSystemRoot = true;
 
 //    qDebug()<<"Finding mkspec for"<<qmakeCommand();
 
@@ -1587,8 +1601,15 @@ void QtVersion::updateAbiAndMkspec() const
         }
     } else if (supportsTargetId(Constants::S60_DEVICE_TARGET_ID)
            || supportsTargetId(Constants::S60_EMULATOR_TARGET_ID)) {
+        if (m_systemRoot.isEmpty())
+            m_validSystemRoot = false;
+
         if (!m_systemRoot.endsWith(QLatin1Char('/')))
             m_systemRoot.append(QLatin1Char('/'));
+
+        QFileInfo cppheader(m_systemRoot + QLatin1String("epoc32/include/stdapis/string.h"));
+        if (!cppheader.exists())
+            m_validSystemRoot = false;
     } else {
         m_systemRoot = QLatin1String("");
     }
@@ -1759,7 +1780,9 @@ bool QtVersion::isValid() const
             && !m_notInstalled
             && m_versionInfo.contains("QT_INSTALL_BINS")
             && (!m_mkspecFullPath.isEmpty() || !m_abiUpToDate)
-            && !m_abis.isEmpty();
+            && !m_abis.isEmpty()
+            && m_qmakeIsExecutable
+            && m_validSystemRoot;
 }
 
 bool QtVersion::toolChainAvailable() const
@@ -1778,6 +1801,8 @@ QString QtVersion::invalidReason() const
         return QString();
     if (qmakeCommand().isEmpty())
         return QCoreApplication::translate("QtVersion", "No qmake path set");
+    if (!m_qmakeIsExecutable)
+        return QCoreApplication::translate("QtVersion", "qmake does not exist or is not executable");
     if (displayName().isEmpty())
         return QCoreApplication::translate("QtVersion", "Qt version has no name");
     if (m_notInstalled)
@@ -1789,6 +1814,8 @@ QString QtVersion::invalidReason() const
         return QCoreApplication::translate("QtVersion", "The default mkspec symlink is broken.");
     if (m_abiUpToDate && m_abis.isEmpty())
         return QCoreApplication::translate("QtVersion", "Failed to detect the ABI(s) used by the Qt version.");
+    if (!m_validSystemRoot)
+        return QCoreApplication::translate("QtVersion", "The \"Open C/C++ plugin\" is not installed in the Symbian SDK or the Symbian SDK path is misconfigured");
     return QString();
 }
 
diff --git a/src/plugins/qt4projectmanager/qtversionmanager.h b/src/plugins/qt4projectmanager/qtversionmanager.h
index 0fbad7f9fdb..8a5b1378631 100644
--- a/src/plugins/qt4projectmanager/qtversionmanager.h
+++ b/src/plugins/qt4projectmanager/qtversionmanager.h
@@ -239,6 +239,8 @@ private:
     mutable QSet<QString> m_targetIds;
 
     mutable bool m_isBuildUsingSbsV2;
+    mutable bool m_qmakeIsExecutable;
+    mutable bool m_validSystemRoot;
 };
 
 struct QMakeAssignment