diff --git a/irr/include/IrrCompileConfig.h b/irr/include/IrrCompileConfig.h
index 3e248cbc0..42fc7fc2d 100644
--- a/irr/include/IrrCompileConfig.h
+++ b/irr/include/IrrCompileConfig.h
@@ -4,19 +4,6 @@
 
 #pragma once
 
-//! Identifies the IrrlichtMt fork customized for the Minetest engine
-#define IRRLICHT_VERSION_MT_REVISION 15
-#define IRRLICHT_VERSION_MT "mt15"
-
-//! Irrlicht SDK Version
-#define IRRLICHT_VERSION_MAJOR 1
-#define IRRLICHT_VERSION_MINOR 9
-#define IRRLICHT_VERSION_REVISION 0
-// This flag will be defined only in SVN, the official release code will have
-// it undefined
-#define IRRLICHT_VERSION_SVN alpha
-#define IRRLICHT_SDK_VERSION "1.9.0" IRRLICHT_VERSION_MT
-
 #ifdef _WIN32
 #define IRRCALLCONV __stdcall
 #else
diff --git a/irr/include/IrrlichtDevice.h b/irr/include/IrrlichtDevice.h
index 8f4105a4f..f0ec9f005 100644
--- a/irr/include/IrrlichtDevice.h
+++ b/irr/include/IrrlichtDevice.h
@@ -194,12 +194,6 @@ public:
 	/** IrrlichtDevice::run() will always return false after closeDevice() was called. */
 	virtual void closeDevice() = 0;
 
-	//! Get the version of the engine.
-	/** The returned string
-	will look like this: "1.2.3" or this: "1.2".
-	\return String which contains the version. */
-	virtual const c8 *getVersion() const = 0;
-
 	//! Sets a new user event receiver which will receive events from the engine.
 	/** Return true in IEventReceiver::OnEvent to prevent the event from continuing along
 	the chain of event receivers. The path that an event takes through the system depends
diff --git a/irr/include/SIrrCreationParameters.h b/irr/include/SIrrCreationParameters.h
index 26e46e324..0cd1a9218 100644
--- a/irr/include/SIrrCreationParameters.h
+++ b/irr/include/SIrrCreationParameters.h
@@ -10,7 +10,6 @@
 #include "ILogger.h"
 #include "position2d.h"
 #include "path.h"
-#include "IrrCompileConfig.h" // for IRRLICHT_SDK_VERSION
 
 namespace irr
 {
@@ -44,7 +43,6 @@ struct SIrrlichtCreationParameters
 #else
 			LoggingLevel(ELL_INFORMATION),
 #endif
-			SDK_version_do_not_use(IRRLICHT_SDK_VERSION),
 			PrivateData(0),
 #ifdef IRR_MOBILE_PATHS
 			OGLES2ShaderPath("media/Shaders/")
@@ -54,37 +52,6 @@ struct SIrrlichtCreationParameters
 	{
 	}
 
-	SIrrlichtCreationParameters(const SIrrlichtCreationParameters &other) :
-			SDK_version_do_not_use(IRRLICHT_SDK_VERSION)
-	{
-		*this = other;
-	}
-
-	SIrrlichtCreationParameters &operator=(const SIrrlichtCreationParameters &other)
-	{
-		DeviceType = other.DeviceType;
-		DriverType = other.DriverType;
-		WindowSize = other.WindowSize;
-		WindowPosition = other.WindowPosition;
-		Bits = other.Bits;
-		ZBufferBits = other.ZBufferBits;
-		Fullscreen = other.Fullscreen;
-		WindowMaximized = other.WindowMaximized;
-		WindowResizable = other.WindowResizable;
-		Stencilbuffer = other.Stencilbuffer;
-		Vsync = other.Vsync;
-		AntiAlias = other.AntiAlias;
-		WithAlphaChannel = other.WithAlphaChannel;
-		Doublebuffer = other.Doublebuffer;
-		Stereobuffer = other.Stereobuffer;
-		EventReceiver = other.EventReceiver;
-		WindowId = other.WindowId;
-		LoggingLevel = other.LoggingLevel;
-		PrivateData = other.PrivateData;
-		OGLES2ShaderPath = other.OGLES2ShaderPath;
-		return *this;
-	}
-
 	//! Type of the device.
 	/** This setting decides the windowing system used by the device, most device types are native
 	to a specific operating system and so may not be available.
@@ -247,11 +214,6 @@ struct SIrrlichtCreationParameters
 	*/
 	ELOG_LEVEL LoggingLevel;
 
-	//! Don't use or change this parameter.
-	/** Always set it to IRRLICHT_SDK_VERSION, which is done by default.
-	This is needed for sdk version checks. */
-	const c8 *const SDK_version_do_not_use;
-
 	//! Define some private data storage.
 	/** Used when platform devices need access to OS specific data structures etc.
 	This is only used for Android at the moment in order to access the native
diff --git a/irr/src/CIrrDeviceStub.cpp b/irr/src/CIrrDeviceStub.cpp
index 2292db191..1ff120d10 100644
--- a/irr/src/CIrrDeviceStub.cpp
+++ b/irr/src/CIrrDeviceStub.cpp
@@ -38,12 +38,6 @@ CIrrDeviceStub::CIrrDeviceStub(const SIrrlichtCreationParameters &params) :
 	os::Printer::Logger = Logger;
 
 	FileSystem = io::createFileSystem();
-
-	core::stringc s = "Irrlicht Engine version ";
-	s.append(getVersion());
-	os::Printer::log(s.c_str(), ELL_INFORMATION);
-
-	checkVersion(params.SDK_version_do_not_use);
 }
 
 CIrrDeviceStub::~CIrrDeviceStub()
@@ -129,12 +123,6 @@ bool CIrrDeviceStub::setWindowIcon(const video::IImage *img)
 	return false;
 }
 
-//! Returns the version of the engine.
-const char *CIrrDeviceStub::getVersion() const
-{
-	return IRRLICHT_SDK_VERSION;
-}
-
 //! \return Returns a pointer to the mouse cursor control interface.
 gui::ICursorControl *CIrrDeviceStub::getCursorControl()
 {
@@ -147,24 +135,6 @@ video::IContextManager *CIrrDeviceStub::getContextManager()
 	return ContextManager;
 }
 
-//! checks version of sdk and prints warning if there might be a problem
-bool CIrrDeviceStub::checkVersion(const char *version)
-{
-	if (strcmp(getVersion(), version)) {
-		core::stringc w;
-		w = "Warning: The library version of the Irrlicht Engine (";
-		w += getVersion();
-		w += ") does not match the version the application was compiled with (";
-		w += version;
-		w += "). This may cause problems.";
-		os::Printer::log(w.c_str(), ELL_WARNING);
-
-		return false;
-	}
-
-	return true;
-}
-
 //! Compares to the last call of this function to return double and triple clicks.
 u32 CIrrDeviceStub::checkSuccessiveClicks(s32 mouseX, s32 mouseY, EMOUSE_INPUT_EVENT inputEvent)
 {
diff --git a/irr/src/CIrrDeviceStub.h b/irr/src/CIrrDeviceStub.h
index 163e44f39..9a1966f01 100644
--- a/irr/src/CIrrDeviceStub.h
+++ b/irr/src/CIrrDeviceStub.h
@@ -70,9 +70,6 @@ public:
 	//! Sets the window icon.
 	bool setWindowIcon(const video::IImage *img) override;
 
-	//! Returns the version of the engine.
-	const char *getVersion() const override;
-
 	//! send the event to the right receiver
 	bool postEventFromUser(const SEvent &event) override;
 
@@ -159,9 +156,6 @@ public:
 protected:
 	void createGUIAndScene();
 
-	//! checks version of SDK and prints warning if there might be a problem
-	bool checkVersion(const char *version);
-
 	//! Compares to the last call of this function to return double and triple clicks.
 	/** Needed for win32 device event handling
 	\return Returns only 1,2 or 3. A 4th click will start with 1 again.
diff --git a/irr/src/CMakeLists.txt b/irr/src/CMakeLists.txt
index 46eaf9cca..23944105f 100644
--- a/irr/src/CMakeLists.txt
+++ b/irr/src/CMakeLists.txt
@@ -56,20 +56,6 @@ elseif(MSVC)
 	add_compile_options(/D_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING)
 endif()
 
-# Sanity-check version
-
-include(CheckCXXSourceCompiles)
-set(CMAKE_REQUIRED_INCLUDES ${PROJECT_SOURCE_DIR}/include)
-unset(REVISION_SANITY_CHECK CACHE)
-check_cxx_source_compiles("#include <IrrCompileConfig.h>\n\
-#if IRRLICHT_VERSION_MT_REVISION != ${IRRLICHTMT_REVISION}\n\
-#error\n\
-#endif\n\
-int main() {}" REVISION_SANITY_CHECK)
-if(NOT REVISION_SANITY_CHECK)
-	message(FATAL_ERROR "IrrlichtMt revision number mismatches between CMake and headers.")
-endif()
-
 # Platform-independent configuration (hard-coded currently)
 add_definitions(
 	-DIRR_ENABLE_BUILTIN_FONT
@@ -246,11 +232,12 @@ endif()
 
 # Required libs
 
+include(CheckCXXSourceCompiles)
+
 find_package(ZLIB REQUIRED)
 find_package(JPEG REQUIRED)
 find_package(PNG REQUIRED)
 
-
 if(ENABLE_GLES1)
 	# only tested on Android, probably works on Linux (is this needed anywhere else?)
 	find_library(OPENGLES_LIBRARY NAMES GLESv1_CM REQUIRED)
diff --git a/src/client/clientlauncher.cpp b/src/client/clientlauncher.cpp
index 93ed392b9..56beba927 100644
--- a/src/client/clientlauncher.cpp
+++ b/src/client/clientlauncher.cpp
@@ -164,11 +164,7 @@ bool ClientLauncher::run(GameStartData &start_data, const Settings &cmd_args)
 	while (m_rendering_engine->run() && !*kill &&
 		!g_gamecallback->shutdown_requested) {
 		// Set the window caption
-#if IRRLICHT_VERSION_MT_REVISION >= 15
 		auto driver_name = m_rendering_engine->getVideoDriver()->getName();
-#else
-		auto driver_name = wide_to_utf8(m_rendering_engine->getVideoDriver()->getName());
-#endif
 		std::string caption = std::string(PROJECT_NAME_C) +
 			" " + g_version_hash +
 			" [" + gettext("Main Menu") + "]" +
diff --git a/src/client/game.cpp b/src/client/game.cpp
index 84b2815c8..849e7702a 100644
--- a/src/client/game.cpp
+++ b/src/client/game.cpp
@@ -1478,11 +1478,7 @@ bool Game::createClient(const GameStartData &start_data)
 
 	/* Set window caption
 	 */
-#if IRRLICHT_VERSION_MT_REVISION >= 15
 	auto driver_name = driver->getName();
-#else
-	auto driver_name = wide_to_utf8(driver->getName());
-#endif
 	std::string str = std::string(PROJECT_NAME_C) +
 			" " + g_version_hash + " [";
 	str += simple_singleplayer_mode ? gettext("Singleplayer")
diff --git a/src/client/shader.cpp b/src/client/shader.cpp
index c6de1ee35..4f84ecbe7 100644
--- a/src/client/shader.cpp
+++ b/src/client/shader.cpp
@@ -368,7 +368,6 @@ ShaderSource::~ShaderSource()
 {
 	MutexAutoLock lock(m_shaderinfo_cache_mutex);
 
-#if IRRLICHT_VERSION_MT_REVISION >= 15
 	// Delete materials
 	video::IGPUProgrammingServices *gpu = RenderingEngine::get_video_driver()->
 		getGPUProgrammingServices();
@@ -377,7 +376,6 @@ ShaderSource::~ShaderSource()
 			gpu->deleteShaderMaterial(i.material);
 	}
 	m_shaderinfo_cache.clear();
-#endif
 }
 
 u32 ShaderSource::getShader(const std::string &name,
@@ -501,7 +499,6 @@ void ShaderSource::rebuildShaders()
 {
 	MutexAutoLock lock(m_shaderinfo_cache_mutex);
 
-#if IRRLICHT_VERSION_MT_REVISION >= 15
 	// Delete materials
 	video::IGPUProgrammingServices *gpu = RenderingEngine::get_video_driver()->
 		getGPUProgrammingServices();
@@ -511,7 +508,6 @@ void ShaderSource::rebuildShaders()
 			i.material = video::EMT_SOLID; // invalidate
 		}
 	}
-#endif
 
 	// Recreate shaders
 	for (ShaderInfo &i : m_shaderinfo_cache) {
diff --git a/src/client/shadows/dynamicshadowsrender.cpp b/src/client/shadows/dynamicshadowsrender.cpp
index ca61d8467..08cdca0ad 100644
--- a/src/client/shadows/dynamicshadowsrender.cpp
+++ b/src/client/shadows/dynamicshadowsrender.cpp
@@ -192,12 +192,7 @@ void ShadowRenderer::addNodeToShadowList(
 {
 	m_shadow_node_array.emplace_back(node, shadowMode);
 	// node should never be ClientMap
-#if IRRLICHT_VERSION_MT_REVISION >= 15
 	assert(!node->getName().has_value() || *node->getName() != "ClientMap");
-#else
-	// TODO: Remove this as soon as we require 1.9.0mt15
-	assert(strcmp(node->getName(), "ClientMap") != 0);
-#endif
 	node->forEachMaterial([this] (auto &mat) {
 		mat.setTexture(TEXTURE_LAYER_SHADOW, shadowMapTextureFinal);
 	});
diff --git a/src/main.cpp b/src/main.cpp
index 763a8ae37..d693a6b5c 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -425,9 +425,6 @@ static void print_version(std::ostream &os)
 {
 	os << PROJECT_NAME_C " " << g_version_hash
 		<< " (" << porting::getPlatformName() << ")" << std::endl;
-#ifndef SERVER
-	os << "Using Irrlicht " IRRLICHT_SDK_VERSION << std::endl;
-#endif
 #if USE_LUAJIT
 	os << "Using " << LUAJIT_VERSION << std::endl;
 #else
diff --git a/src/script/lua_api/l_mainmenu.cpp b/src/script/lua_api/l_mainmenu.cpp
index 44b4b57e7..c98f974d2 100644
--- a/src/script/lua_api/l_mainmenu.cpp
+++ b/src/script/lua_api/l_mainmenu.cpp
@@ -996,12 +996,7 @@ int ModApiMainMenu::l_get_active_driver(lua_State *L)
 
 int ModApiMainMenu::l_get_active_renderer(lua_State *L)
 {
-#if IRRLICHT_VERSION_MT_REVISION >= 15
 	lua_pushstring(L, RenderingEngine::get_video_driver()->getName());
-#else
-	auto tmp = wide_to_utf8(RenderingEngine::get_video_driver()->getName());
-	lua_pushstring(L, tmp.c_str());
-#endif
 	return 1;
 }