diff --git a/src/kassistantdialog.cpp b/src/kassistantdialog.cpp
--- a/src/kassistantdialog.cpp
+++ b/src/kassistantdialog.cpp
@@ -25,7 +25,7 @@
 
 #include <QHash>
 
-class KAssistantDialog::Private
+class Q_DECL_HIDDEN KAssistantDialog::Private
 {
 public:
     Private(KAssistantDialog *q)
diff --git a/src/kcapacitybar.cpp b/src/kcapacitybar.cpp
--- a/src/kcapacitybar.cpp
+++ b/src/kcapacitybar.cpp
@@ -40,7 +40,7 @@
 static const int MidShade = 200;
 static const int DarkShade = 300;
 
-class KCapacityBar::Private
+class Q_DECL_HIDDEN KCapacityBar::Private
 {
 public:
     Private(KCapacityBar::DrawTextMode drawTextMode)
diff --git a/src/kcharselect.cpp b/src/kcharselect.cpp
--- a/src/kcharselect.cpp
+++ b/src/kcharselect.cpp
@@ -59,7 +59,7 @@
     void _k_slotSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected);
 };
 
-class KCharSelect::KCharSelectPrivate
+class Q_DECL_HIDDEN KCharSelect::KCharSelectPrivate
 {
 public:
     struct HistoryItem {
diff --git a/src/kcolorbutton.cpp b/src/kcolorbutton.cpp
--- a/src/kcolorbutton.cpp
+++ b/src/kcolorbutton.cpp
@@ -32,7 +32,7 @@
 #include <QMouseEvent>
 #include <QStyleOptionButton>
 
-class KColorButton::KColorButtonPrivate
+class Q_DECL_HIDDEN KColorButton::KColorButtonPrivate
 {
 public:
     KColorButtonPrivate(KColorButton *q);
diff --git a/src/kdatepicker.cpp b/src/kdatepicker.cpp
--- a/src/kdatepicker.cpp
+++ b/src/kdatepicker.cpp
@@ -118,7 +118,7 @@
     setText(QString::number(year));
 }
 
-class KDatePicker::KDatePickerPrivate
+class Q_DECL_HIDDEN KDatePicker::KDatePickerPrivate
 {
 public:
     KDatePickerPrivate(KDatePicker *q) :
diff --git a/src/kfontchooser.cpp b/src/kfontchooser.cpp
--- a/src/kfontchooser.cpp
+++ b/src/kfontchooser.cpp
@@ -76,7 +76,7 @@
     return QLocale::system().toString(size, 'f', (size == floor(size)) ? 0 : 1);
 }
 
-class KFontChooser::Private
+class Q_DECL_HIDDEN KFontChooser::Private
 {
 public:
     Private(KFontChooser *qq)
diff --git a/src/kfontrequester.cpp b/src/kfontrequester.cpp
--- a/src/kfontrequester.cpp
+++ b/src/kfontrequester.cpp
@@ -84,7 +84,7 @@
     return result;
 }
 
-class KFontRequester::KFontRequesterPrivate
+class Q_DECL_HIDDEN KFontRequester::KFontRequesterPrivate
 {
 public:
     KFontRequesterPrivate(KFontRequester *q): q(q) {}
diff --git a/src/kfontsizeaction.cpp b/src/kfontsizeaction.cpp
--- a/src/kfontsizeaction.cpp
+++ b/src/kfontsizeaction.cpp
@@ -34,7 +34,7 @@
 #include <QToolBar>
 #include <QToolButton>
 
-class KFontSizeAction::Private
+class Q_DECL_HIDDEN KFontSizeAction::Private
 {
 public:
     Private(KFontSizeAction *parent)
diff --git a/src/kled.cpp b/src/kled.cpp
--- a/src/kled.cpp
+++ b/src/kled.cpp
@@ -26,7 +26,7 @@
 #include <QStyle>
 #include <QStyleOption>
 
-class KLed::Private
+class Q_DECL_HIDDEN KLed::Private
 {
 public:
     Private()
diff --git a/src/kmimetypechooser.cpp b/src/kmimetypechooser.cpp
--- a/src/kmimetypechooser.cpp
+++ b/src/kmimetypechooser.cpp
@@ -288,7 +288,7 @@
 
 //BEGIN KMimeTypeChooserDialog::Private
 
-class KMimeTypeChooserDialog::Private
+class Q_DECL_HIDDEN KMimeTypeChooserDialog::Private
 {
 public:
     Private(KMimeTypeChooserDialog *parent)
diff --git a/src/knewpassworddialog.cpp b/src/knewpassworddialog.cpp
--- a/src/knewpassworddialog.cpp
+++ b/src/knewpassworddialog.cpp
@@ -35,7 +35,7 @@
 
 #include "ui_knewpassworddialog.h"
 
-class KNewPasswordDialog::KNewPasswordDialogPrivate
+class Q_DECL_HIDDEN KNewPasswordDialog::KNewPasswordDialogPrivate
 {
 public:
     KNewPasswordDialogPrivate(KNewPasswordDialog *parent)
diff --git a/src/knewpasswordwidget.cpp b/src/knewpasswordwidget.cpp
--- a/src/knewpasswordwidget.cpp
+++ b/src/knewpasswordwidget.cpp
@@ -25,7 +25,7 @@
 #include "knewpasswordwidget.h"
 #include "ui_knewpasswordwidget.h"
 
-class KNewPasswordWidget::KNewPasswordWidgetPrivate
+class Q_DECL_HIDDEN KNewPasswordWidget::KNewPasswordWidgetPrivate
 {
 public:
     KNewPasswordWidgetPrivate(KNewPasswordWidget *parent)
diff --git a/src/kpagewidgetmodel.cpp b/src/kpagewidgetmodel.cpp
--- a/src/kpagewidgetmodel.cpp
+++ b/src/kpagewidgetmodel.cpp
@@ -29,7 +29,7 @@
 
 #include <QIcon>
 
-class KPageWidgetItem::Private
+class Q_DECL_HIDDEN KPageWidgetItem::Private
 {
 public:
     Private()
diff --git a/src/kpassworddialog.cpp b/src/kpassworddialog.cpp
--- a/src/kpassworddialog.cpp
+++ b/src/kpassworddialog.cpp
@@ -33,7 +33,7 @@
 #include "ui_kpassworddialog.h"
 
 /** @internal */
-class KPasswordDialog::KPasswordDialogPrivate
+class Q_DECL_HIDDEN KPasswordDialog::KPasswordDialogPrivate
 {
 public:
     KPasswordDialogPrivate(KPasswordDialog *q)
diff --git a/src/kpixmapregionselectordialog.cpp b/src/kpixmapregionselectordialog.cpp
--- a/src/kpixmapregionselectordialog.cpp
+++ b/src/kpixmapregionselectordialog.cpp
@@ -27,7 +27,7 @@
 
 #include <kpixmapregionselectorwidget.h>
 
-class KPixmapRegionSelectorDialog::Private
+class Q_DECL_HIDDEN KPixmapRegionSelectorDialog::Private
 {
 public:
     Private(KPixmapRegionSelectorDialog *parent)
diff --git a/src/kpixmapregionselectorwidget.cpp b/src/kpixmapregionselectorwidget.cpp
--- a/src/kpixmapregionselectorwidget.cpp
+++ b/src/kpixmapregionselectorwidget.cpp
@@ -36,7 +36,7 @@
 #include <QApplication>
 #include <QMouseEvent>
 
-class KPixmapRegionSelectorWidget::Private
+class Q_DECL_HIDDEN KPixmapRegionSelectorWidget::Private
 {
 public:
     Private(KPixmapRegionSelectorWidget *q): q(q) {}
diff --git a/src/kpixmapsequence.cpp b/src/kpixmapsequence.cpp
--- a/src/kpixmapsequence.cpp
+++ b/src/kpixmapsequence.cpp
@@ -27,7 +27,7 @@
 #include <QtCore/QVector>
 #include <QtCore/QtDebug>
 
-class KPixmapSequence::Private : public QSharedData
+class Q_DECL_HIDDEN KPixmapSequence::Private : public QSharedData
 {
 public:
     QVector<QPixmap> mFrames;
diff --git a/src/kpixmapsequenceoverlaypainter.cpp b/src/kpixmapsequenceoverlaypainter.cpp
--- a/src/kpixmapsequenceoverlaypainter.cpp
+++ b/src/kpixmapsequenceoverlaypainter.cpp
@@ -29,7 +29,7 @@
 #include <QtCore/QPointer>
 #include <QtCore/QCoreApplication>
 
-class KPixmapSequenceOverlayPainter::Private
+class Q_DECL_HIDDEN KPixmapSequenceOverlayPainter::Private
 {
 public:
     void init(KPixmapSequenceOverlayPainter *p);
diff --git a/src/kpixmapsequencewidget.cpp b/src/kpixmapsequencewidget.cpp
--- a/src/kpixmapsequencewidget.cpp
+++ b/src/kpixmapsequencewidget.cpp
@@ -21,7 +21,7 @@
 #include "kpixmapsequenceoverlaypainter.h"
 #include "kpixmapsequence.h"
 
-class KPixmapSequenceWidget::Private
+class Q_DECL_HIDDEN KPixmapSequenceWidget::Private
 {
 public:
     KPixmapSequenceOverlayPainter *m_painter;
diff --git a/src/kpopupframe.cpp b/src/kpopupframe.cpp
--- a/src/kpopupframe.cpp
+++ b/src/kpopupframe.cpp
@@ -26,7 +26,7 @@
 #include <QEventLoop>
 #include <QKeyEvent>
 
-class KPopupFrame::KPopupFramePrivate
+class Q_DECL_HIDDEN KPopupFrame::KPopupFramePrivate
 {
 public:
     KPopupFramePrivate(KPopupFrame *q);
diff --git a/src/kratingpainter.cpp b/src/kratingpainter.cpp
--- a/src/kratingpainter.cpp
+++ b/src/kratingpainter.cpp
@@ -27,7 +27,7 @@
 #include <QtCore/QRect>
 #include <QtCore/QPoint>
 
-class KRatingPainter::Private
+class Q_DECL_HIDDEN KRatingPainter::Private
 {
 public:
     Private()
diff --git a/src/kratingwidget.cpp b/src/kratingwidget.cpp
--- a/src/kratingwidget.cpp
+++ b/src/kratingwidget.cpp
@@ -27,7 +27,7 @@
 #include <QImage>
 #include <QIcon>
 
-class KRatingWidget::Private
+class Q_DECL_HIDDEN KRatingWidget::Private
 {
 public:
     Private()
diff --git a/src/kselector.cpp b/src/kselector.cpp
--- a/src/kselector.cpp
+++ b/src/kselector.cpp
@@ -34,7 +34,7 @@
 
 #define ARROWSIZE 5
 
-class KSelector::Private
+class Q_DECL_HIDDEN KSelector::Private
 {
 public:
     Private()
diff --git a/src/ksplittercollapserbutton.cpp b/src/ksplittercollapserbutton.cpp
--- a/src/ksplittercollapserbutton.cpp
+++ b/src/ksplittercollapserbutton.cpp
@@ -54,7 +54,7 @@
     {Qt::DownArrow,  Qt::UpArrow}
 };
 
-class KSplitterCollapserButton::Private
+class Q_DECL_HIDDEN KSplitterCollapserButton::Private
 {
 public:
     Private(KSplitterCollapserButton *qq);
diff --git a/src/ktitlewidget.cpp b/src/ktitlewidget.cpp
--- a/src/ktitlewidget.cpp
+++ b/src/ktitlewidget.cpp
@@ -29,7 +29,7 @@
 #include <QIcon>
 #include <QStyle>
 
-class KTitleWidget::Private
+class Q_DECL_HIDDEN KTitleWidget::Private
 {
 public:
     Private(KTitleWidget *parent)
diff --git a/src/ktoggleaction.cpp b/src/ktoggleaction.cpp
--- a/src/ktoggleaction.cpp
+++ b/src/ktoggleaction.cpp
@@ -29,7 +29,7 @@
 
 #include <kguiitem.h>
 
-class KToggleAction::Private
+class Q_DECL_HIDDEN KToggleAction::Private
 {
 public:
     Private(KToggleAction *_parent)
diff --git a/src/ktogglefullscreenaction.cpp b/src/ktogglefullscreenaction.cpp
--- a/src/ktogglefullscreenaction.cpp
+++ b/src/ktogglefullscreenaction.cpp
@@ -29,7 +29,7 @@
 
 #include <QtCore/QEvent>
 
-class KToggleFullScreenAction::Private
+class Q_DECL_HIDDEN KToggleFullScreenAction::Private
 {
 public:
     Private(KToggleFullScreenAction *action)
diff --git a/src/ktoolbarlabelaction.cpp b/src/ktoolbarlabelaction.cpp
--- a/src/ktoolbarlabelaction.cpp
+++ b/src/ktoolbarlabelaction.cpp
@@ -23,7 +23,7 @@
 #include <QLabel>
 #include <QToolBar>
 
-class KToolBarLabelAction::Private
+class Q_DECL_HIDDEN KToolBarLabelAction::Private
 {
 public:
     QPointer<QAction> buddy;
diff --git a/src/ktoolbarpopupaction.cpp b/src/ktoolbarpopupaction.cpp
--- a/src/ktoolbarpopupaction.cpp
+++ b/src/ktoolbarpopupaction.cpp
@@ -31,7 +31,7 @@
 #include <QToolBar>
 #include <QToolButton>
 
-class KToolBarPopupAction::Private
+class Q_DECL_HIDDEN KToolBarPopupAction::Private
 {
 public:
     Private()
diff --git a/src/ktooltipwidget.cpp b/src/ktooltipwidget.cpp
--- a/src/ktooltipwidget.cpp
+++ b/src/ktooltipwidget.cpp
@@ -30,7 +30,7 @@
 #include <QVBoxLayout>
 #include <QWindow>
 
-class KToolTipWidget::KToolTipWidgetPrivate
+class Q_DECL_HIDDEN KToolTipWidget::KToolTipWidgetPrivate
 {
 public:
     KToolTipWidgetPrivate(KToolTipWidget *parent)
diff --git a/src/kurllabel.cpp b/src/kurllabel.cpp
--- a/src/kurllabel.cpp
+++ b/src/kurllabel.cpp
@@ -22,7 +22,7 @@
 #include <QMouseEvent>
 #include <QPalette>
 
-class KUrlLabel::Private
+class Q_DECL_HIDDEN KUrlLabel::Private
 {
 public:
     Private(const QString &_url, KUrlLabel *_parent)
diff --git a/src/kxyselector.cpp b/src/kxyselector.cpp
--- a/src/kxyselector.cpp
+++ b/src/kxyselector.cpp
@@ -33,7 +33,7 @@
  * The contents of the selector are drawn by derived class.
  */
 
-class KXYSelector::Private
+class Q_DECL_HIDDEN KXYSelector::Private
 {
 public:
     Private(KXYSelector *q):