If using Qt5, use Qt5LinguistTools to locate lupdate/lrelease

CMakeLists.txt

@@ -132,6 +132,7 @@ IF(WANT_QT5)
 
 	FIND_PACKAGE(Qt5Core REQUIRED)
 	FIND_PACKAGE(Qt5Gui REQUIRED)
+	FIND_PACKAGE(Qt5LinguistTools REQUIRED)
 	FIND_PACKAGE(Qt5Widgets REQUIRED)
 	FIND_PACKAGE(Qt5Xml REQUIRED)
 

src/CMakeLists.txt

@@ -132,6 +132,11 @@ IF(LMMS_BUILD_MSYS AND CMAKE_BUILD_TYPE STREQUAL "Debug")
 	TARGET_LINK_LIBRARIES(lmms QtCore4 QtGui4 QtXml4)
 ENDIF()
 
+if (QT5)
+	set (QT_LUPDATE_EXECUTABLE "${Qt5_LUPDATE_EXECUTABLE}")
+	set (QT_LRELEASE_EXECUTABLE "${Qt5_LRELEASE_EXECUTABLE}")
+endif ()
+
 #
 # rules for building localizations
 #