diff -ur a/lib/irrlicht/source/Irrlicht/CIrrDeviceLinux.cpp b/lib/irrlicht/source/Irrlicht/CIrrDeviceLinux.cpp
--- a/lib/irrlicht/source/Irrlicht/CIrrDeviceLinux.cpp	2021-09-28 11:02:26.000000000 +0100
+++ b/lib/irrlicht/source/Irrlicht/CIrrDeviceLinux.cpp	2021-10-29 23:30:44.714768031 +0100
@@ -35,7 +35,7 @@
 #include <GL/gl.h>
 #ifdef _IRR_OPENGL_USE_EXTPOINTER_
 #define GLX_GLXEXT_PROTOTYPES
-#include "glxext.h"
+#include <GL/glxext.h>
 #endif
 #endif
 
diff -ur a/lib/irrlicht/source/Irrlicht/COpenGLExtensionHandler.h b/lib/irrlicht/source/Irrlicht/COpenGLExtensionHandler.h
--- a/lib/irrlicht/source/Irrlicht/COpenGLExtensionHandler.h	2021-09-28 11:02:26.000000000 +0100
+++ b/lib/irrlicht/source/Irrlicht/COpenGLExtensionHandler.h	2021-10-29 23:30:44.715768059 +0100
@@ -30,7 +30,7 @@
 	#endif
 	#include <GL/gl.h>
 	#if defined(_IRR_OPENGL_USE_EXTPOINTER_)
-		#include "glext.h"
+		#include <GL/glext.h>
 	#endif
 	#include "wglext.h"
 
@@ -45,7 +45,7 @@
 	#endif
 	#include <OpenGL/gl.h>
 	#if defined(_IRR_OPENGL_USE_EXTPOINTER_)
-		#include "glext.h"
+		#include <GL/glext.h>
 	#endif
 #endif
 
diff -ur a/lib/irrlicht/source/Irrlicht/COpenGLSLMaterialRenderer.h b/lib/irrlicht/source/Irrlicht/COpenGLSLMaterialRenderer.h
--- a/lib/irrlicht/source/Irrlicht/COpenGLSLMaterialRenderer.h	2021-09-28 11:02:26.000000000 +0100
+++ b/lib/irrlicht/source/Irrlicht/COpenGLSLMaterialRenderer.h	2021-10-29 23:30:44.715768059 +0100
@@ -20,7 +20,7 @@
 	#define WIN32_LEAN_AND_MEAN
 	#include <windows.h>
 	#include <GL/gl.h>
-	#include "glext.h"
+	#include <GL/glext.h>
 #else
 #if defined(_IRR_OPENGL_USE_EXTPOINTER_)
 	#define GL_GLEXT_LEGACY 1
@@ -34,7 +34,7 @@
 	#include <GL/gl.h>
 #endif
 #if defined(_IRR_OPENGL_USE_EXTPOINTER_)
-	#include "glext.h"
+	#include <GL/glext.h>
 #endif
 #endif