diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5e9c7c860b..7f6e0f9db1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -219,7 +219,7 @@ else()
 endif()
 LYX_COMBO(DEBUG_SANITIZE    "Use sanitize check" NONE ADDRESS UNSPECIFIED)
 #LYX_COMBO(USE_FILEDIALOG    "Use native or QT file dialog" QT NATIVE)
-LYX_COMBO(USE_QT            "Use Qt version as frontend" AUTO QT4 QT5 QT6)
+LYX_COMBO(USE_QT            "Use Qt version as frontend" AUTO QT5 QT6)
 LYX_COMBO(USE_IPO           "Interprocedural optimization" OFF AUTO ON)
 #LYX_OPTION(3RDPARTY_BUILD   "Build 3rdparty libs" OFF ALL)
 LYX_OPTION(DISABLE_CALLSTACK_PRINTING "do not print a callstack when crashing" OFF ALL)
@@ -764,10 +764,7 @@ if(LYX_USE_QT MATCHES "AUTO")
 			set(LYX_USE_QT "QT5" CACHE STRING "Valid qt version" FORCE)
 			message(STATUS "Qt5Core_VERSION = ${Qt5Core_VERSION}")
 			if(Qt5Core_VERSION VERSION_LESS ${min_qt5_version})
-				find_package(Qt4 "4.5.0" QUIET)
-				if(QT4_FOUND)
-					set(LYX_USE_QT "QT4" CACHE STRING "Valid qt version" FORCE)
-				endif()
+				message(FATAL_ERROR "No appropriate QT-version found")
 			endif()
 		else()
 			set(LYX_USE_QT "QT4" CACHE STRING "Valid qt version" FORCE)
@@ -811,8 +808,8 @@ if(LYX_USE_QT MATCHES "QT6|QT5")
 		set(QTVERSION ${${QtVal}Core_VERSION})
 		if (QTVERSION VERSION_LESS ${min_qt5_version})
 			message(STATUS "QTVERSION = \"${QTVERSION}\"")
-			message(STATUS "This version is not recommended, try either option -DLYX_USE_QT=QT4 or")
-			message(STATUS "install QT-Version >= \"${min_qt5_version}\"")
+			message(STATUS "This version is not recommended,")
+			message(STATUS "please install QT-Version >= \"${min_qt5_version}\"")
 			# see thread in lyx-devel list
 			# From: Jean-Pierre Chrétien <jeanpierre.chretien@free.fr>
 			# Date 11.03.2017
@@ -837,24 +834,6 @@ if(LYX_USE_QT MATCHES "QT6|QT5")
 			set(QtCore5CompatModule Core5Compat)
 		endif()
 	endif()
-elseif(LYX_USE_QT MATCHES "QT4")
-	if(LYX_XMINGW)
-		set(QT_MINGW_DIR ${LYX_QT4} CACHE PATH "Qt for Mingw" FORCE)
-		list(APPEND CMAKE_FIND_ROOT_PATH ${QT_MINGW_DIR} ${GNUWIN32_DIR})
-	endif()
-	find_package(Qt4 "4.5.0" REQUIRED)
-	macro (qt_use_modules)
-	endmacro()
-	macro (qt_add_resources)
-		qt4_add_resources(${ARGN})
-	endmacro()
-	macro (qt_wrap_uifiles)
-		qt4_wrap_ui(${ARGN})
-	endmacro()
-        set(LYX_QTMAIN_LIBRARY ${QT_QTSVG_LIBRARY})
-	if(WIN32)
-		list(APPEND LYX_QTMAIN_LIBRARY ${QT_QTMAIN_LIBRARIES})
-	endif()
 else()
   message(FATAL_ERROR "Unhandled value for LYX_USE_QT (${LYX_USE_QT})")
 endif()
@@ -1194,7 +1173,7 @@ unset(opts)
 unset(tmp_vi)
 
 if(QTVERSION MATCHES "^([0-9]+)\\.([0-9]+)\\.([0-9]+).*")
-	MATH(EXPR QT4_VERSION "(${CMAKE_MATCH_1}<<16)|(${CMAKE_MATCH_2}<<8)|${CMAKE_MATCH_3}")
+	MATH(EXPR QTx_VERSION "(${CMAKE_MATCH_1}<<16)|(${CMAKE_MATCH_2}<<8)|${CMAKE_MATCH_3}")
 endif()
 
 
diff --git a/development/cmake/modules/LyXMacros.cmake b/development/cmake/modules/LyXMacros.cmake
index 2d93f46976..5104265510 100644
--- a/development/cmake/modules/LyXMacros.cmake
+++ b/development/cmake/modules/LyXMacros.cmake
@@ -111,7 +111,7 @@ macro(LYX_AUTOMOC)
 					#set(_moc ${_abs_PATH}/${_current_MOC})
 					add_custom_command(OUTPUT ${_moc}
 							  COMMAND ${QT_MOC_EXECUTABLE}
-							  ARGS "-DQT_VERSION=${QT4_VERSION}" ${_def} ${_moc_INCS} ${_header} -o ${_moc}
+							  ARGS "-DQT_VERSION=${QTx_VERSION}" ${_def} ${_moc_INCS} ${_header} -o ${_moc}
 							  MAIN_DEPENDENCY ${_header})
 					macro_add_file_dependencies(${_abs_FILE} ${_moc})
 					SET_SOURCE_FILES_PROPERTIES(${_moc} GENERATED)