diff --git a/TCFoundation/TCLocalStrings.cpp b/TCFoundation/TCLocalStrings.cpp
index f4643ea7..a472b9c2 100644
--- a/TCFoundation/TCLocalStrings.cpp
+++ b/TCFoundation/TCLocalStrings.cpp
@@ -855,7 +855,9 @@ TCLocalStrings::TCLocalStringsCleanup::~TCLocalStringsCleanup(void)
 // Note: Code Page 1252 is Windows Latin I, which is the default.
 TCLocalStrings::TCLocalStrings(void):
 #if !defined(WIN32) && !defined(__APPLE__) && !defined(_OSMESA)
+#if QT_VERSION < QT_VERSION_CHECK(6,0,0) || defined(QT_CORE5COMPAT_LIB)
 	m_textCodec(NULL),
+#endif
 #endif // WIN32
 	m_codePage(UTF8_CODE_PAGE)
 {
@@ -1267,7 +1269,7 @@ void TCLocalStrings::instSetCodePage(int codePage)
 	QString name;
 
 	name = QString("CP%1").arg(codePage);
-#if QT_VERSION < QT_VERSION_CHECK(6,0,0) || defined(QT_BUILD_CORE5COMPAT_LIB)
+#if QT_VERSION < QT_VERSION_CHECK(6,0,0) || defined(QT_CORE5COMPAT_LIB)
 	m_textCodec =
 		QTextCodec::codecForName((const char *)name.toLatin1().constData());
 #endif
@@ -1500,9 +1502,9 @@ void TCLocalStrings::mbstowstring(std::wstring &dst, const char *src,
 		}
 	}
 #if !defined(WIN32) && !defined(__APPLE__) && !defined(_OSMESA)
+#if QT_VERSION < QT_VERSION_CHECK(6,0,0) || defined(QT_CORE5COMPAT_LIB)
 	else if (m_textCodec)
 	{
-#if QT_VERSION < QT_VERSION_CHECK(6,0,0) || defined(QT_BUILD_CORE5COMPAT_LIB)
 		QString unicodeString = m_textCodec->toUnicode(src);
 		dst.clear();
 		dst.resize(unicodeString.length());
@@ -1512,8 +1514,8 @@ void TCLocalStrings::mbstowstring(std::wstring &dst, const char *src,
 
 			dst[i] = (wchar_t)qchar.unicode();
 		}
-#endif
 	}
+#endif
 #endif // WIN32
 	else
 	{
diff --git a/TCFoundation/TCLocalStrings.h b/TCFoundation/TCLocalStrings.h
index bb1bd3d4..1d24031e 100644
--- a/TCFoundation/TCLocalStrings.h
+++ b/TCFoundation/TCLocalStrings.h
@@ -7,8 +7,10 @@
 #ifdef _QT
 #include <QtCore/qglobal.h>
 #if QT_VERSION >= 0x60000 
-#if defined(QT_BUILD_CORE5COMPAT_LIB)
+#if defined(QT_CORE5COMPAT_LIB)
 #include <QtCore5Compat/QTextCodec>
+#else
+#include <QtCore/QString>
 #endif
 #else
 #include <QtCore/QTextCodec>
@@ -62,8 +64,9 @@ class TCExport TCLocalStrings: public TCObject
 #if !defined(WIN32) && !defined(__APPLE__) && !defined(_OSMESA)
 	//QStringQStringMap m_qStrings;
 	QString m_emptyQString;
+#if QT_VERSION < QT_VERSION_CHECK(6,0,0) || defined(QT_CORE5COMPAT_LIB)
 	QTextCodec *m_textCodec;
-
+#endif
 	//void buildQStringMap(void);
 #endif // WIN32