diff --git a/src/plugins/qmlprojectmanager/qmlprojectmanagerconstants.h b/src/plugins/qmlprojectmanager/qmlprojectmanagerconstants.h
index 6cd599cf80ff21e3529f8eac74eaec364ee4d89b..1a257bd3d1bfdd4177746123c6bcc7dcd4a78559 100644
--- a/src/plugins/qmlprojectmanager/qmlprojectmanagerconstants.h
+++ b/src/plugins/qmlprojectmanager/qmlprojectmanagerconstants.h
@@ -40,7 +40,6 @@ const char * const QML_VIEWER_TARGET_ID = "QmlProjectManager.QmlTarget";
 const char * const QML_VIEWER_TARGET_DISPLAY_NAME = "QML Viewer";
 const char * const QML_MAINSCRIPT_KEY = "QmlProjectManager.QmlRunConfiguration.MainScript";
 const char * const USER_ENVIRONMENT_CHANGES_KEY("QmlProjectManager.QmlRunConfiguration.UserEnvironmentChanges");
-const char * const BASE_ENVIRONMENT_BASE_KEY("QmlProjectManager.QmlRunConfiguration.BaseEnvironmentBase");
 
 
 } // namespace Constants
diff --git a/src/plugins/qmlprojectmanager/qmlprojectrunconfiguration.cpp b/src/plugins/qmlprojectmanager/qmlprojectrunconfiguration.cpp
index 7cac48a2b40514b06189db2c168ad27f3d063db0..9e085998809e975271fee289017ea35b76c95853 100644
--- a/src/plugins/qmlprojectmanager/qmlprojectrunconfiguration.cpp
+++ b/src/plugins/qmlprojectmanager/qmlprojectrunconfiguration.cpp
@@ -57,8 +57,7 @@ QmlProjectRunConfiguration::QmlProjectRunConfiguration(QmlProjectTarget *parent)
     m_qtVersionId(-1),
     m_projectTarget(parent),
     m_usingCurrentFile(true),
-    m_isEnabled(false),
-    m_baseEnvironmentBase(BuildEnvironmentBase)
+    m_isEnabled(false)
 {
     ctor();
     updateQtVersions();
@@ -70,8 +69,7 @@ QmlProjectRunConfiguration::QmlProjectRunConfiguration(QmlProjectTarget *parent,
     m_qtVersionId(source->m_qtVersionId),
     m_qmlViewerArgs(source->m_qmlViewerArgs),
     m_projectTarget(parent),
-    m_userEnvironmentChanges(source->m_userEnvironmentChanges),
-    m_baseEnvironmentBase(source->m_baseEnvironmentBase)
+    m_userEnvironmentChanges(source->m_userEnvironmentChanges)
 {
     ctor();
     setMainScript(source->m_scriptFile);
@@ -234,8 +232,6 @@ QVariantMap QmlProjectRunConfiguration::toMap() const
     map.insert(QLatin1String(Constants::QML_MAINSCRIPT_KEY),  m_scriptFile);
     map.insert(QLatin1String(Constants::USER_ENVIRONMENT_CHANGES_KEY),
                Utils::EnvironmentItem::toStringList(m_userEnvironmentChanges));
-    map.insert(QLatin1String(Constants::BASE_ENVIRONMENT_BASE_KEY),
-               static_cast<int>(m_baseEnvironmentBase));
     return map;
 }
 
@@ -246,11 +242,6 @@ bool QmlProjectRunConfiguration::fromMap(const QVariantMap &map)
     m_scriptFile = map.value(QLatin1String(Constants::QML_MAINSCRIPT_KEY), M_CURRENT_FILE).toString();
     m_userEnvironmentChanges = Utils::EnvironmentItem::fromStringList(
                 map.value(QLatin1String(Constants::USER_ENVIRONMENT_CHANGES_KEY)).toStringList());
-    m_baseEnvironmentBase
-            = static_cast<BaseEnvironmentBase>(
-                map.value(QLatin1String(Constants::BASE_ENVIRONMENT_BASE_KEY),
-                          static_cast<int>(BuildEnvironmentBase)).toInt());
-
 
 
     updateQtVersions();
@@ -342,32 +333,10 @@ bool QmlProjectRunConfiguration::isValidVersion(Qt4ProjectManager::QtVersion *ve
 Utils::Environment QmlProjectRunConfiguration::baseEnvironment() const
 {
     Utils::Environment env;
-
-    if (m_baseEnvironmentBase == QmlProjectRunConfiguration::CleanEnvironmentBase) {
-        // Nothing
-    } else  if (m_baseEnvironmentBase == QmlProjectRunConfiguration::SystemEnvironmentBase) {
-        env = Utils::Environment::systemEnvironment();
-    } else if (m_baseEnvironmentBase == QmlProjectRunConfiguration::BuildEnvironmentBase) {
-        env = qtVersion()->qmlToolsEnvironment();
-    }
+    env = qtVersion()->qmlToolsEnvironment();
     return env;
 }
 
-void QmlProjectRunConfiguration::setBaseEnvironmentBase(BaseEnvironmentBase env)
-{
-    if (m_baseEnvironmentBase == env)
-        return;
-    m_baseEnvironmentBase = env;
-    if (m_configurationWidget)
-        m_configurationWidget.data()->baseEnvironmentChanged();
-}
-
-QmlProjectRunConfiguration::BaseEnvironmentBase
-QmlProjectRunConfiguration::baseEnvironmentBase() const
-{
-    return m_baseEnvironmentBase;
-}
-
 void QmlProjectRunConfiguration::setUserEnvironmentChanges(const QList<Utils::EnvironmentItem> &diff)
 {
     if (m_userEnvironmentChanges != diff) {
diff --git a/src/plugins/qmlprojectmanager/qmlprojectrunconfiguration.h b/src/plugins/qmlprojectmanager/qmlprojectrunconfiguration.h
index 5319cd13638c456901d95e55549298479f3e9dea..75d60e677fbbb578ead5e060c88c6207d3217b97 100644
--- a/src/plugins/qmlprojectmanager/qmlprojectrunconfiguration.h
+++ b/src/plugins/qmlprojectmanager/qmlprojectrunconfiguration.h
@@ -111,12 +111,6 @@ private:
     void setQtVersionId(int id);
 
     Utils::Environment baseEnvironment() const;
-    enum BaseEnvironmentBase { CleanEnvironmentBase = 0,
-                               SystemEnvironmentBase = 1,
-                               BuildEnvironmentBase = 2};
-
-    void setBaseEnvironmentBase(BaseEnvironmentBase env);
-    BaseEnvironmentBase baseEnvironmentBase() const;
     void setUserEnvironmentChanges(const QList<Utils::EnvironmentItem> &diff);
     QList<Utils::EnvironmentItem> userEnvironmentChanges() const;
 
@@ -136,7 +130,6 @@ private:
     bool m_isEnabled;
 
     QList<Utils::EnvironmentItem> m_userEnvironmentChanges;
-    BaseEnvironmentBase m_baseEnvironmentBase;
 };
 
 } // namespace QmlProjectManager
diff --git a/src/plugins/qmlprojectmanager/qmlprojectrunconfigurationwidget.cpp b/src/plugins/qmlprojectmanager/qmlprojectrunconfigurationwidget.cpp
index 694650bc9e59640ccf48a75c6adc50e7f9fc124b..8a35caac25340a261fe6242ca4a7374aef8c8129 100644
--- a/src/plugins/qmlprojectmanager/qmlprojectrunconfigurationwidget.cpp
+++ b/src/plugins/qmlprojectmanager/qmlprojectrunconfigurationwidget.cpp
@@ -153,22 +153,9 @@ QmlProjectRunConfigurationWidget::QmlProjectRunConfigurationWidget(QmlProjectRun
     QWidget *baseEnvironmentWidget = new QWidget;
     QHBoxLayout *baseEnvironmentLayout = new QHBoxLayout(baseEnvironmentWidget);
     baseEnvironmentLayout->setMargin(0);
-    QLabel *label = new QLabel(tr("Base environment for this runconfiguration:"), this);
-    baseEnvironmentLayout->addWidget(label);
-    m_baseEnvironmentComboBox = new QComboBox(this);
-    m_baseEnvironmentComboBox->addItems(QStringList()
-                                        << tr("Clean Environment")
-                                        << tr("System Environment")
-                                        << tr("Build Environment"));
-    m_baseEnvironmentComboBox->setCurrentIndex(rc->baseEnvironmentBase());
-    connect(m_baseEnvironmentComboBox, SIGNAL(currentIndexChanged(int)),
-            this, SLOT(baseEnvironmentSelected(int)));
-    baseEnvironmentLayout->addWidget(m_baseEnvironmentComboBox);
-    baseEnvironmentLayout->addStretch(10);
-
     m_environmentWidget = new ProjectExplorer::EnvironmentWidget(this, baseEnvironmentWidget);
     m_environmentWidget->setBaseEnvironment(rc->baseEnvironment());
-    m_environmentWidget->setBaseEnvironmentText(baseEnvironmentText());
+    m_environmentWidget->setBaseEnvironmentText(tr("System Environment"));
     m_environmentWidget->setUserChanges(rc->userEnvironmentChanges());
 
     connect(m_environmentWidget, SIGNAL(userChangesChanged()),
@@ -282,46 +269,11 @@ void QmlProjectRunConfigurationWidget::userChangesChanged()
     m_runConfiguration->setUserEnvironmentChanges(m_environmentWidget->userChanges());
 }
 
-void QmlProjectRunConfigurationWidget::baseEnvironmentChanged()
-{
-//    if (m_ignoreChange)
-//        return;
-
-    int index = QmlProjectRunConfiguration::BaseEnvironmentBase(
-            m_runConfiguration->baseEnvironmentBase());
-    m_baseEnvironmentComboBox->setCurrentIndex(index);
-    m_environmentWidget->setBaseEnvironment(m_runConfiguration->baseEnvironment());
-    m_environmentWidget->setBaseEnvironmentText(baseEnvironmentText());
-}
-
 void QmlProjectRunConfigurationWidget::userEnvironmentChangesChanged()
 {
     m_environmentWidget->setUserChanges(m_runConfiguration->userEnvironmentChanges());
 }
 
-void QmlProjectRunConfigurationWidget::baseEnvironmentSelected(int index)
-{
-//    m_ignoreChange = true;
-    m_runConfiguration->setBaseEnvironmentBase(
-                QmlProjectRunConfiguration::BaseEnvironmentBase(index));
-
-    m_environmentWidget->setBaseEnvironment(m_runConfiguration->baseEnvironment());
-    m_environmentWidget->setBaseEnvironmentText(baseEnvironmentText());
-//    m_ignoreChange = false;
-}
-
-QString QmlProjectRunConfigurationWidget::baseEnvironmentText() const
-{
-    if (m_runConfiguration->m_baseEnvironmentBase
-            == QmlProjectRunConfiguration::CleanEnvironmentBase) {
-        return tr("Clean Environment");
-    } else if (m_runConfiguration->m_baseEnvironmentBase
-             == QmlProjectRunConfiguration::SystemEnvironmentBase) {
-        return tr("System Environment");
-    } else {
-        return tr("Build Environment");
-    }
-}
 
 } // namespace Internal
 } // namespace QmlProjectManager
diff --git a/src/plugins/qmlprojectmanager/qmlprojectrunconfigurationwidget.h b/src/plugins/qmlprojectmanager/qmlprojectrunconfigurationwidget.h
index ca156355d267ef3c2a243d156147ea27be61eca3..e043eedb6859f538ed6028e9e587bf4cdace4438 100644
--- a/src/plugins/qmlprojectmanager/qmlprojectrunconfigurationwidget.h
+++ b/src/plugins/qmlprojectmanager/qmlprojectrunconfigurationwidget.h
@@ -57,7 +57,6 @@ public:
 
 public slots:
     void updateQtVersionComboBox();
-    void baseEnvironmentChanged();
     void userEnvironmentChangesChanged();
 
 private slots:
@@ -71,14 +70,10 @@ private slots:
     void qmlDebugServerPortChanged(uint port);
 
     void userChangesChanged();
-    void baseEnvironmentSelected(int index);
 
     void manageQtVersions();
 
 private:
-    QString baseEnvironmentText() const;
-
-
     QmlProjectRunConfiguration *m_runConfiguration;
 
     QComboBox *m_qtVersionComboBox;
@@ -86,7 +81,6 @@ private:
     QStringListModel *m_fileListModel;
 
     ProjectExplorer::EnvironmentWidget *m_environmentWidget;
-    QComboBox *m_baseEnvironmentComboBox;
 };
 
 } // namespace Internal