Fix some compile error against qt6

src/main.cpp

@@ -17,9 +17,10 @@
 int main(int argc, char **argv)
 {
     // enable high dpi support
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     QCoreApplication::setAttribute(Qt::AA_UseHighDpiPixmaps, true);
     QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling, true);
-
+#endif
     QApplication app(argc, argv);
 
     KLocalizedString::setApplicationDomain("ksystemlog");

src/modes/base/parsingHelper.cpp

@@ -8,6 +8,7 @@
 
 #include <KFormat>
 #include <KLocalizedString>
+#include <QRegExp>
 
 #include "ksystemlog_debug.h"
 

src/modes/cups/cupsAccessAnalyzer.h

@@ -15,7 +15,7 @@
 #include "parsingHelper.h"
 
 #include "cupsAccessLogMode.h"
-
+#include <QRegExp>
 class CupsAccessAnalyzer : public FileAnalyzer
 {
     Q_OBJECT

src/modes/cups/cupsPageAnalyzer.h

@@ -15,7 +15,7 @@
 #include "parsingHelper.h"
 
 #include "cupsPageLogMode.h"
-
+#include <QRegExp>
 class CupsPageAnalyzer : public FileAnalyzer
 {
     Q_OBJECT

src/modes/cups/cupsPdfAnalyzer.h

@@ -15,7 +15,7 @@
 #include "parsingHelper.h"
 
 #include "cupsPdfLogMode.h"
-
+#include <QRegExp>
 class CupsPdfAnalyzer : public FileAnalyzer
 {
     Q_OBJECT