diff --git a/playground/anchors/kiwi/Solver.cpp b/playground/anchors/kiwi/Solver.cpp
index a0a6a9b5..9db163b9 100644
--- a/playground/anchors/kiwi/Solver.cpp
+++ b/playground/anchors/kiwi/Solver.cpp
@@ -79,8 +79,8 @@ class FlatMap
 
     inline typename std::vector< T >::iterator lowerBound( const Key& key ) const
     {
-        auto cmp = []( const T& entry, const Key& key )
-            { return entry.key() < key; };
+        auto cmp = []( const T& entry, const Key& k )
+            { return entry.key() < k; };
 
         auto& entries = const_cast< std::vector< T >& >( m_entries );
         return std::lower_bound( entries.begin(), entries.end(), key, cmp );
diff --git a/src/common/QskFunctions.cpp b/src/common/QskFunctions.cpp
index 986daa2a..62adce3c 100644
--- a/src/common/QskFunctions.cpp
+++ b/src/common/QskFunctions.cpp
@@ -234,7 +234,8 @@ float qskConstrainedRadians( float radians )
     return radians;
 }
 
-// do not export;
+QSK_HIDDEN_EXTERNAL_BEGIN
+
 bool qskHasEnvironment( const char* env )
 {
     bool ok;
@@ -247,3 +248,5 @@ bool qskHasEnvironment( const char* env )
     auto result = qgetenv( env );
     return !result.isEmpty() && result != "false";
 }
+
+QSK_HIDDEN_EXTERNAL_END
diff --git a/src/common/QskGlobal.h b/src/common/QskGlobal.h
index 408d6e2b..de6dcd40 100644
--- a/src/common/QskGlobal.h
+++ b/src/common/QskGlobal.h
@@ -43,6 +43,13 @@
 #define QSK_QT_PRIVATE_END \
     QT_WARNING_POP
 
+#define QSK_HIDDEN_EXTERNAL_BEGIN \
+    QT_WARNING_PUSH \
+    QT_WARNING_DISABLE_GCC("-Wmissing-declarations")
+
+#define QSK_HIDDEN_EXTERNAL_END \
+    QT_WARNING_POP
+
 #if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
     using QskHashValue = uint;
 #else
diff --git a/src/controls/QskControlPrivate.cpp b/src/controls/QskControlPrivate.cpp
index d8f402ba..9713fa1b 100644
--- a/src/controls/QskControlPrivate.cpp
+++ b/src/controls/QskControlPrivate.cpp
@@ -84,6 +84,8 @@ namespace
     };
 }
 
+QSK_HIDDEN_EXTERNAL_BEGIN
+
 QLocale qskInheritedLocale( const QObject* object )
 {
     VisitorLocale visitor;
@@ -101,6 +103,16 @@ void qskInheritLocale( QObject* object, const QLocale& locale )
     QskObjectTree::traverseDown( object, visitor );
 }
 
+void qskInheritSection( QskControl* control, QskAspect::Section section )
+{
+    VisitorSection visitor;
+    visitor.setResolveValue( section );
+
+    QskObjectTree::traverseDown( control, visitor );
+}
+
+QSK_HIDDEN_EXTERNAL_END
+
 static QskAspect::Section qskInheritedSection( const QskControl* control )
 {
     VisitorSection visitor;
@@ -110,14 +122,6 @@ static QskAspect::Section qskInheritedSection( const QskControl* control )
     return visitor.resolveValue();
 }
 
-void qskInheritSection( QskControl* control, QskAspect::Section section )
-{
-    VisitorSection visitor;
-    visitor.setResolveValue( section );
-
-    QskObjectTree::traverseDown( control, visitor );
-}
-
 /*
     Qt 5.12:
         sizeof( QQuickItemPrivate::ExtraData ) -> 184
diff --git a/src/controls/QskItem.cpp b/src/controls/QskItem.cpp
index e77cea62..fa2add84 100644
--- a/src/controls/QskItem.cpp
+++ b/src/controls/QskItem.cpp
@@ -1136,10 +1136,14 @@ QSGNode* QskItem::updateItemPaintNode( QSGNode* node )
     return node;
 }
 
+QSK_HIDDEN_EXTERNAL_BEGIN
+
 void qskUpdateItemFlags()
 {
     if ( qskRegistry )
         qskRegistry->updateItemFlags();
 }
 
+QSK_HIDDEN_EXTERNAL_END
+
 #include "moc_QskItem.cpp"
diff --git a/src/controls/QskItemAnchors.cpp b/src/controls/QskItemAnchors.cpp
index 580dc191..796dfc45 100644
--- a/src/controls/QskItemAnchors.cpp
+++ b/src/controls/QskItemAnchors.cpp
@@ -257,12 +257,12 @@ void QskItemAnchors::addAnchors( Qt::Corner corner,
     QQuickItem* settledItem, Qt::Corner settledItemCorner )
 {
     auto anchorPoint =
-        []( Qt::Corner corner, Qt::Orientation orientation )
+        []( Qt::Corner cn, Qt::Orientation orientation )
         {
             if ( orientation == Qt::Horizontal )
-                return ( corner & 0x1 ) ? Qt::AnchorRight : Qt::AnchorLeft;
+                return ( cn & 0x1 ) ? Qt::AnchorRight : Qt::AnchorLeft;
             else
-                return ( corner >= 0x2 ) ? Qt::AnchorBottom : Qt::AnchorTop;
+                return ( cn >= 0x2 ) ? Qt::AnchorBottom : Qt::AnchorTop;
         };
 
     addAnchor( anchorPoint( corner, Qt::Horizontal ),
diff --git a/src/controls/QskSkin.cpp b/src/controls/QskSkin.cpp
index ce464470..c73ea2ce 100644
--- a/src/controls/QskSkin.cpp
+++ b/src/controls/QskSkin.cpp
@@ -126,6 +126,8 @@ static inline QskSkinlet* qskNewSkinlet( const QMetaObject* metaObject, QskSkin*
 
 // also used in QskSkinTransition.cpp TODO ...
 
+QSK_HIDDEN_EXTERNAL_BEGIN
+
 QFont qskResolvedFont( const QHash< QskFontRole, QFont >& fontTable,
     const QskFontRole& fontRole )
 {
@@ -140,6 +142,8 @@ QFont qskResolvedFont( const QHash< QskFontRole, QFont >& fontTable,
     return QGuiApplication::font();
 }
 
+QSK_HIDDEN_EXTERNAL_END
+
 namespace
 {
     class SkinletData
diff --git a/src/controls/QskWindow.cpp b/src/controls/QskWindow.cpp
index 5d520db7..b811a38e 100644
--- a/src/controls/QskWindow.cpp
+++ b/src/controls/QskWindow.cpp
@@ -482,6 +482,8 @@ void QskWindow::resetLocale()
     qskResolveLocale( this );
 }
 
+QSK_HIDDEN_EXTERNAL_BEGIN
+
 bool qskInheritLocale( QskWindow* window, const QLocale& locale )
 {
     auto d = static_cast< QskWindowPrivate* >( QQuickWindowPrivate::get( window ) );
@@ -495,6 +497,8 @@ bool qskInheritLocale( QskWindow* window, const QLocale& locale )
     return true;
 }
 
+QSK_HIDDEN_EXTERNAL_END
+
 static void qskResolveLocale( QskWindow* window )
 {
     auto d = static_cast< QskWindowPrivate* >( QQuickWindowPrivate::get( window ) );