diff --git a/data/CMakeLists.txt b/data/CMakeLists.txt
--- a/data/CMakeLists.txt
+++ b/data/CMakeLists.txt
@@ -59,3 +59,4 @@
 
 # set PIC to allow use in static and shared libs
 set_property(TARGET SyntaxHighlightingData PROPERTY POSITION_INDEPENDENT_CODE 1)
+target_link_libraries(SyntaxHighlightingData PRIVATE Qt5::Core)
diff --git a/src/lib/abstracthighlighter.h b/src/lib/abstracthighlighter.h
--- a/src/lib/abstracthighlighter.h
+++ b/src/lib/abstracthighlighter.h
@@ -30,7 +30,9 @@
 
 #include <memory>
 
+QT_BEGIN_NAMESPACE
 class QString;
+QT_END_NAMESPACE
 
 namespace KSyntaxHighlighting {
 
@@ -186,6 +188,8 @@
 };
 }
 
+QT_BEGIN_NAMESPACE
 Q_DECLARE_INTERFACE(KSyntaxHighlighting::AbstractHighlighter, "org.kde.SyntaxHighlighting.AbstractHighlighter")
+QT_END_NAMESPACE
 
 #endif // KSYNTAXHIGHLIGHTING_ABSTRACTHIGHLIGHTERM_H
diff --git a/src/lib/abstracthighlighter_p.h b/src/lib/abstracthighlighter_p.h
--- a/src/lib/abstracthighlighter_p.h
+++ b/src/lib/abstracthighlighter_p.h
@@ -27,7 +27,9 @@
 #include "definition.h"
 #include "theme.h"
 
+QT_BEGIN_NAMESPACE
 class QStringList;
+QT_END_NAMESPACE
 
 namespace KSyntaxHighlighting {
 
diff --git a/src/lib/context_p.h b/src/lib/context_p.h
--- a/src/lib/context_p.h
+++ b/src/lib/context_p.h
@@ -34,7 +34,9 @@
 
 #include <vector>
 
+QT_BEGIN_NAMESPACE
 class QXmlStreamReader;
+QT_END_NAMESPACE
 
 namespace KSyntaxHighlighting {
 
diff --git a/src/lib/definition.h b/src/lib/definition.h
--- a/src/lib/definition.h
+++ b/src/lib/definition.h
@@ -31,10 +31,12 @@
 
 #include <memory>
 
+QT_BEGIN_NAMESPACE
 class QChar;
 class QString;
 class QStringList;
 template <typename T> class QVector;
+QT_END_NAMESPACE
 
 namespace KSyntaxHighlighting {
 
@@ -391,6 +393,8 @@
 
 }
 
+QT_BEGIN_NAMESPACE
 Q_DECLARE_TYPEINFO(KSyntaxHighlighting::Definition, Q_MOVABLE_TYPE);
+QT_END_NAMESPACE
 
 #endif
diff --git a/src/lib/foldingregion.h b/src/lib/foldingregion.h
--- a/src/lib/foldingregion.h
+++ b/src/lib/foldingregion.h
@@ -101,6 +101,8 @@
 
 }
 
+QT_BEGIN_NAMESPACE
 Q_DECLARE_TYPEINFO(KSyntaxHighlighting::FoldingRegion, Q_PRIMITIVE_TYPE);
+QT_END_NAMESPACE
 
 #endif
diff --git a/src/lib/format.h b/src/lib/format.h
--- a/src/lib/format.h
+++ b/src/lib/format.h
@@ -30,10 +30,11 @@
 #include <QExplicitlySharedDataPointer>
 #include <QTypeInfo>
 
-
+QT_BEGIN_NAMESPACE
 class QColor;
 class QString;
 class QXmlStreamReader;
+QT_END_NAMESPACE
 
 namespace KSyntaxHighlighting {
 
@@ -144,6 +145,8 @@
 };
 }
 
+QT_BEGIN_NAMESPACE
 Q_DECLARE_TYPEINFO(KSyntaxHighlighting::Format, Q_MOVABLE_TYPE);
+QT_END_NAMESPACE
 
 #endif // KSYNTAXHIGHLIGHTING_FORMAT_H
diff --git a/src/lib/htmlhighlighter.h b/src/lib/htmlhighlighter.h
--- a/src/lib/htmlhighlighter.h
+++ b/src/lib/htmlhighlighter.h
@@ -32,8 +32,10 @@
 
 #include <memory>
 
+QT_BEGIN_NAMESPACE
 class QFile;
 class QTextStream;
+QT_END_NAMESPACE
 
 namespace KSyntaxHighlighting {
 
diff --git a/src/lib/keywordlist_p.h b/src/lib/keywordlist_p.h
--- a/src/lib/keywordlist_p.h
+++ b/src/lib/keywordlist_p.h
@@ -30,7 +30,9 @@
 
 #include <vector>
 
+QT_BEGIN_NAMESPACE
 class QXmlStreamReader;
+QT_END_NAMESPACE
 
 namespace KSyntaxHighlighting {
 
diff --git a/src/lib/repository.h b/src/lib/repository.h
--- a/src/lib/repository.h
+++ b/src/lib/repository.h
@@ -29,8 +29,10 @@
 #include <qglobal.h>
 #include <memory>
 
+QT_BEGIN_NAMESPACE
 class QString;
 template <typename T> class QVector;
+QT_END_NAMESPACE
 
 /**
  * @namespace KSyntaxHighlighting
diff --git a/src/lib/repository_p.h b/src/lib/repository_p.h
--- a/src/lib/repository_p.h
+++ b/src/lib/repository_p.h
@@ -27,7 +27,9 @@
 #include <QHash>
 #include <QVector>
 
+QT_BEGIN_NAMESPACE
 class QString;
+QT_END_NAMESPACE
 
 namespace KSyntaxHighlighting {
 
diff --git a/src/lib/rule_p.h b/src/lib/rule_p.h
--- a/src/lib/rule_p.h
+++ b/src/lib/rule_p.h
@@ -38,7 +38,9 @@
 
 #include <memory>
 
+QT_BEGIN_NAMESPACE
 class QXmlStreamReader;
+QT_END_NAMESPACE
 
 namespace KSyntaxHighlighting {
 
diff --git a/src/lib/state.h b/src/lib/state.h
--- a/src/lib/state.h
+++ b/src/lib/state.h
@@ -79,6 +79,8 @@
 
 }
 
+QT_BEGIN_NAMESPACE
 Q_DECLARE_TYPEINFO(KSyntaxHighlighting::State, Q_MOVABLE_TYPE);
+QT_END_NAMESPACE
 
 #endif // KSYNTAXHIGHLIGHTING_STATE_H
diff --git a/src/lib/theme.h b/src/lib/theme.h
--- a/src/lib/theme.h
+++ b/src/lib/theme.h
@@ -371,6 +371,8 @@
 
 }
 
+QT_BEGIN_NAMESPACE
 Q_DECLARE_TYPEINFO(KSyntaxHighlighting::Theme, Q_MOVABLE_TYPE);
+QT_END_NAMESPACE
 
 #endif // KSYNTAXHIGHLIGHTING_THEME_H
diff --git a/src/lib/themedata_p.h b/src/lib/themedata_p.h
--- a/src/lib/themedata_p.h
+++ b/src/lib/themedata_p.h
@@ -163,6 +163,8 @@
 
 }
 
+QT_BEGIN_NAMESPACE
 Q_DECLARE_TYPEINFO(KSyntaxHighlighting::TextStyleData, Q_MOVABLE_TYPE);
+QT_END_NAMESPACE
 
 #endif // KSYNTAXHIGHLIGHTING_THEMEDATA_P_H
diff --git a/src/lib/wildcardmatcher.cpp b/src/lib/wildcardmatcher.cpp
--- a/src/lib/wildcardmatcher.cpp
+++ b/src/lib/wildcardmatcher.cpp
@@ -79,5 +79,5 @@
 bool WildcardMatcher::exactMatch(const QString &candidate, const QString &wildcard,
                                  bool caseSensitive)
 {
-    return exactMatch(candidate, wildcard, candidate.length() - 1, wildcard.length() - 1, caseSensitive);
+    return ::exactMatch(candidate, wildcard, candidate.length() - 1, wildcard.length() - 1, caseSensitive);
 }
diff --git a/src/lib/wildcardmatcher_p.h b/src/lib/wildcardmatcher_p.h
--- a/src/lib/wildcardmatcher_p.h
+++ b/src/lib/wildcardmatcher_p.h
@@ -24,7 +24,11 @@
 #ifndef KSYNTAXHIGHLIGHTING_WILDCARDMATCHER_P_H
 #define KSYNTAXHIGHLIGHTING_WILDCARDMATCHER_P_H
 
+#include <QtGlobal>
+
+QT_BEGIN_NAMESPACE
 class QString;
+QT_END_NAMESPACE
 
 namespace KSyntaxHighlighting {