--- a/kwin-5.22.5/src/plugins/platforms/x11/common/eglonxbackend.cpp	2021-09-15 11:44:25.579228678 -0300
+++ a/kwin-5.22.5/src/plugins/platforms/x11/common/eglonxbackend.cpp	2021-09-15 11:45:30.850314271 -0300
@@ -217,7 +217,7 @@ 
     }
 
     // Window is 64 bits on a 64-bit architecture whereas xcb_window_t is always 32 bits.
-    unsigned long nativeWindow = window;
+    uintptr_t nativeWindow = window;
 
     EGLSurface surface = EGL_NO_SURFACE;
     if (havePlatformBase()) {