diff --git a/autotests/kconfigloadertest.cpp b/autotests/kconfigloadertest.cpp
--- a/autotests/kconfigloadertest.cpp
+++ b/autotests/kconfigloadertest.cpp
@@ -161,7 +161,7 @@
     expected.append(5);
     expected.append(8);
 
-    QVERIFY(typeItem->isEqual(qVariantFromValue(expected)));
+    QVERIFY(typeItem->isEqual(QVariant::fromValue(expected)));
 }
 
 void ConfigLoaderTest::longLongDefaultValue()
diff --git a/autotests/kconfigtest.cpp b/autotests/kconfigtest.cpp
--- a/autotests/kconfigtest.cpp
+++ b/autotests/kconfigtest.cpp
@@ -1341,7 +1341,7 @@
 #ifdef Q_OS_UNIX
     QDateTime mtime = QFileInfo(path).lastModified().addSecs(-nsec);
     struct utimbuf utbuf;
-    utbuf.actime = mtime.toTime_t();
+    utbuf.actime = mtime.toSecsSinceEpoch();
     utbuf.modtime = utbuf.actime;
     utime(QFile::encodeName(path), &utbuf);
 #else
diff --git a/src/core/kcoreconfigskeleton.cpp b/src/core/kcoreconfigskeleton.cpp
--- a/src/core/kcoreconfigskeleton.cpp
+++ b/src/core/kcoreconfigskeleton.cpp
@@ -255,7 +255,7 @@
 
 QVariant KCoreConfigSkeleton::ItemUrl::property() const
 {
-    return qVariantFromValue<QUrl>(mReference);
+    return QVariant::fromValue<QUrl>(mReference);
 }
 
 KCoreConfigSkeleton::ItemProperty::ItemProperty(const QString &_group,
@@ -955,7 +955,7 @@
 
 QVariant KCoreConfigSkeleton::ItemUrlList::property() const
 {
-    return qVariantFromValue<QList<QUrl> >(mReference);
+    return QVariant::fromValue<QList<QUrl> >(mReference);
 }
 
 KCoreConfigSkeleton::ItemIntList::ItemIntList(const QString &_group, const QString &_key,
@@ -990,7 +990,7 @@
 
 QVariant KCoreConfigSkeleton::ItemIntList::property() const
 {
-    return qVariantFromValue< QList<int> >(mReference);
+    return QVariant::fromValue< QList<int> >(mReference);
 }
 
 //static int kCoreConfigSkeletionDebugArea() { static int s_area = KDebug::registerArea("kdecore (KConfigSkeleton)"); return s_area; }
diff --git a/src/kconf_update/kconf_update.cpp b/src/kconf_update/kconf_update.cpp
--- a/src/kconf_update/kconf_update.cpp
+++ b/src/kconf_update/kconf_update.cpp
@@ -200,10 +200,11 @@
             QFileInfo info(file);
 
             KConfigGroup cg(m_config, fileName);
-            const QDateTime ctime = QDateTime::fromTime_t(cg.readEntry("ctime", 0u));
-            const QDateTime mtime = QDateTime::fromTime_t(cg.readEntry("mtime", 0u));
+            const QDateTime ctime = QDateTime::fromSecsSinceEpoch(cg.readEntry("ctime", 0u));
+            const QDateTime mtime = QDateTime::fromSecsSinceEpoch(cg.readEntry("mtime", 0u));
             if (!dirtyOnly ||
-                    (ctime != info.created()) || (mtime != info.lastModified())) {
+                    (ctime.isValid() && ctime != info.birthTime()) ||
+                     mtime != info.lastModified()) {
                 result.append(file);
             }
         }
@@ -372,8 +373,10 @@
 
     QFileInfo info(filename);
     KConfigGroup cg(m_config, m_currentFilename);
-    cg.writeEntry("ctime", info.created().toTime_t());
-    cg.writeEntry("mtime", info.lastModified().toTime_t());
+    if (info.birthTime().isValid()) {
+        cg.writeEntry("ctime", info.birthTime().toSecsSinceEpoch());
+    }
+    cg.writeEntry("mtime", info.lastModified().toSecsSinceEpoch());
     cg.sync();
     return true;
 }
diff --git a/src/kconfig_compiler/kconfig_compiler.cpp b/src/kconfig_compiler/kconfig_compiler.cpp
--- a/src/kconfig_compiler/kconfig_compiler.cpp
+++ b/src/kconfig_compiler/kconfig_compiler.cpp
@@ -1282,8 +1282,7 @@
     for (QList<Param>::ConstIterator it = parameters.constBegin();
             it != parameters.constEnd(); ++it) {
         if (paramString.contains("$(" + (*it).name + ')')) {
-            QString tmp;
-            tmp.sprintf("%%%d", i++);
+            const QString tmp = QStringLiteral("%%1").arg(i++);
             paramString.replace("$(" + (*it).name + ')', tmp);
             arguments += ".arg( mParam" + (*it).name + " )";
         }